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Second fire at Delhi’s Ghazipur landfill in two weeks

There was an inferno at the capital’s biggest landfill on March 28 as well, which smouldered for three days, bellowing thick smoke over a large area that included Ghazipur, Kondli, Patparganj, IP Extension, Kaushambi and Khoda in Delhi and neighbouring Uttar Pradesh In the second such incident in recent weeks, there was a big fire at the Ghazipur landfill late on Saturday night that took three hours to douse. The authorities blamed the fire partly on the high temperatures prevailing in the region. The fire was reported at around 10.30pm on Saturday, an East Delhi Municipal Corporation (EDMC) spokesperson said. “It was brought under the control during the night by deploying six bulldozers and seeking help of the fire department,” the spokesperson said. There was an inferno at the capital’s biggest landfill on March 28 as well, which smouldered for three days, bellowing thick smoke over a large area that included Ghazipur, Kondli, Patparganj, IP Extension, Kaushambi and Khoda in Delhi and neighbouring Uttar Pradesh. EDMC is looking for a new site to dump over 2,000 tonnes of garbage that is overloading the Ghazipur landfill that is estimated to hold 14 million tonnes of legacy waste accumulated over the past 38 years. The fire at landfills is caused due to methane emanating from decomposing waste, and it is a natural phenomenon observed all across the world, said Shyam Sunder Aggarwal, mayor of EDMC. “Delhi is facing record temperatures, due to which such incidents are happening again and again,” he said. “It is a natural phenomenon which cannot be stopped, but we have made adequate arrangements for controlling fires by placing bulldozers and water tankers on standby.” Durgesh Pathak of the Aam Aadmi party, who co-ordinates with Delhi’s municipal corporations on behalf of the Delhi government, accused the Bharatiya Janata Party of not doing enough to manage the landfills. The EDMC is controlled by the BJP. Although EDMC is dumping 2,000 tonnes of fresh garbage everyday at Ghazipur, down from 2,800 tonnes daily earlier, the municipality still needs to stop using the overloaded landfill, Aggarwal said. “A 12 acre site has been sought for fresh waste near Ghazipur paper market. We will create 12 feet high walls and a green belt to ensure that no stench in felt in neighbouring area,” he said. “It is Delhi’s waste and it needs to disposed somewhere.” Cities Fresh dumping was temporarily halted in September 2017 when a section of the landfill collapsed, claiming the lives of two people. EDMC’s efforts to divert waste to Rani Khera , Sonia Vihar and Ghonda Gujran have faced resistance from local residents and invited adverse comments from the National Green Tribunal. The BJP has repeatedly made false promises concerning these three landfill sites, alleged Pathak. “In 2017, state BJP chief Manoj Tiwari had promised that if voted to power in the MCD, their party will get rid of all three of these landfills within a year,” he said. “It is unfortunate that instead of working on the disposal of the existing landfill sites, the BJP has asked the central government for another stretch of land in Delhi for a new landfill site.” The BJP said Pathak’s allegations lack logic. “Durgesh Pathak has said we will not let any landfill site to come up in Delhi. Will he tell the people if he won’t allow any landfill site, where would the disposal of garbage take place in Delhi? Major cities in the world have at least one or more landfill sites,” said Delhi BJP spokesperson Praveen Shankar Kapoor. The management of garbage disposal has been hampered due to lack of funds at the municipalities and the work needs to be speeded up, Kapoor admitted. The people of Delhi are suffering due to fires at the landfill and the BJP-led corporations do not have solution for Ghazipur’s mountain of garbage, AAP MLA Atishi said. “Now the Centre will directly manage the MCD (Municipal Corporation of Delhi), so will the PMO (Prime Minister’s Office) find a solution to this issue?” she asked. Parliament enacted a law on April 5 to merge all three municipal corporations of Delhi. There are no quick fixes for the garbage disposal problem, according to Atin Biswas, a waste management expert and program director of municipal solid waste sector at the Centre for Science and Environment, an advocacy group. “Our immediate concern should be the dumping of fresh waste, which decomposes much faster and leads to generation of combustible greenhouse gases. The sites are 30-40 years old, but the problematic fraction of waste is a much recent addition,” Biswas said. The landfill management teams should ensure that compaction of fresh waste is carried out to remove any air pockets so that methane cannot come in contact with oxygen, which leads to combustion, he said. Additionally, an inert soil layer should be developed, Biswas said. Landfill fires occur in dump sites all across the country, but Delhi’s scale is much larger as the city produces such a huge volume of garbage. The national capital generates more than 11,119 tonnes of garbage everyday, out of which 6,473 tonnes is dumped at landfills, 4,550 tonnes is sent to three waste to energy plants, and the rest is composted.

Humidity Plays Major Role In Delhi’s Heat Wave Conditions

New Delhi: Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. Avikal Somvanshi, Program Manager, Urban Analytical Lab at the Center for Science & Environment, explained: “March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year’s data shows, it was drier than average March at about 40 per cent. ”

Low Humidity Resulting from Lack of Western Disturbances & Winds Responsible for Delhi's Prolonged Heatwave Conditions

Since mid-March, Delhi-NCR has experienced two instances of heatwave conditions, and experts seem to believe that the humidity factor is primarily responsible for this. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9°C against its normal value of 29.6°C, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi's base station, recorded zero rainfall in March. Relative humidity for the month hovered around 60-70% in the initial days and lowered down to less than 30%. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: "March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47%. This year's data shows it was drier than average March at about 40%." The reasons for very low humidity in March are mainly two. "March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that, there was no Western Disturbance, and as a result, there was unusually low humidity (and therefore, more heat) during March," Somvanshi said. "This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. "Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches," he added. In March, the month starts with generally 60-70% humidity, which decreases to about 40-odd per cent by March-end. This year, instead of March-end, this 40-point level was reached by mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years, and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, 'feels like' temperature - '25 but feels like 35'. This phenomenon generally happens in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD's former director-general (meteorology) Ranjan Kelkar said: "February is a winter month, and March is supposed to be a summer month. The transition — which usually occurs around the festival of Holi — sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way — cold weather may extend into March, or warm weather may fit in early." Kelkar also pointed toward the role of Western Disturbances and the winds. "In winters, if there is going to be WDs, they come, as the name says, from the west side of India — from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. "Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the 'wind' is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry," he said. "The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture," Kelkar said. "In June, as the monsoon approaches, the atmosphere becomes laden with moisture, and that is worse because that makes Delhi's atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains."

Urban Waste Management in India: All You Need to Know About the Challenges, Solutions

The Ministries of Environment, Forestry, and Climate Change (MoEFCC) and Housing and Urban Affairs (MoHUA) have, over the years, collaborated to develop policies and programmes to address these concerns. However, according to some experts, due to lack of clarity and understanding among stakeholders, as well as poor enforcement by regulators, a majority of these have failed to fulfil their goals. Despite the efforts of several organisations, experts say, the problems related to collecting, transporting and disposing of solid waste remain unresolved in metropolitan areas, where fast-growing populations generate increasing amounts of waste that urban local bodies (ULBs) are unable to efficiently manage. In urban India, solid waste management (SWM) has become one of the most significant development concerns owing to microbial decomposition, climate conditions, refuse properties, and land-filling activities. PROBLEMS AND SOLUTIONS Prof. Sudha Goel, for example, advises regular monitoring and data collecting are crucial for developing an efficient SWM system in her study, ‘Municipal Solid Waste Management in India: A Critical Review’. Two other researchers, Rajkumar Joshi and Sirajuddin Ahmed, in their 2016 research paper, stated that Municipal Solid Waste Management (MSWM) has failed due to a lack of awareness and technical competence, insufficient budget and ineffective execution of laws and policies. Another study outlined the various tools for overcoming urban waste management problems in India. It stated that urban waste management should be streamlined using technology, and the SWM system should be made techno-economically viable and sustainable. THE CLASSIFICATION Solid waste is classified into three types: • Biodegradable waste or organic waste (food and kitchen waste, green waste (vegetables, flowers, leaves, fruits, and paper, for example) • Inert and non-biodegradable waste (construction and demolition waste, dirt, debris, for example) • Recyclable waste (plastic, paper, bottles, glasses, etc.) On July 3, 2020, the MoHUA released the toolkit for the Swachh Survekshan 2021. As part of it, a new award category called ‘Pretak Daaur Samman’ was announced. The new award will classify cities based on six performance indicators, which are: • Segregation of waste into wet, dry and hazard categories • Processing capacity against wet waste generated • Construction and Demolition (C and D) waste processing. • Percentage of waste going to landfills. • Sanitation status of cities C AND D WASTE According to a report released on August 25, 2020, by the Delhi-based non-profit Centre for Science and Environment (CSE), India recycles only 1% of its C and D waste. As per the Building Material Promotion Council, the country generates an estimated 150 million tonnes of C and D waste each year. However, the official recycling capacity is only 6,500 tonnes per day or about 1%. Advertisement While releasing the report, Sunita Narain, CSE director general said: “Our study shows that as many as 53 cities were expected to set up recycling facilities to recover material from C and D waste by 2017 — but only 13 cities have done that by 2020. This is unacceptable when the demand for primary building material, including minerals, stone, sand, iron ore, aluminium and timber, is growing at an unprecedented rate.” “A significant proportion of construction waste can be recycled and reused and brought back to construction to substitute naturally sourced material. This demands a circular economy that can turn C and D waste into a resource. This can help reduce energy intensity and environmental footprints of buildings and infrastructure,” she added. Recently, the Nagpur Municipal Corporation (NMC) has decided to collect and reuse C and D waste generated across the city on daily basis. Additionally, it was said that the process to hire a private operator for the purpose was completed in just two days, rather than the typical 30 to 45 days. The operator will have to introduce a helpline number on which citizens can call to get their C and D waste lifted. The operator will also have the right to recover charges from bulk waste generators like builders. Separately in Noida, on April 10, demolition experts are planning a test explosion of the Supertech twin towers. The test explosion is required to optimise and ensure that the exact amount of explosives to be utilised is known — as more explosives would cause debris to disperse all over. According to the plan, while the structures will be demolished in nine seconds, the debris will likely take at least three months to be removed. The debris could be disposed of in a low-lying region or processed at a C and D waste facility. Furthermore, it was reported that on a weekly basis, the area’s dust and noise levels are measured, the amount of waste generated is logged and daily water use is calculated. On-site dust separators have also been installed. But containing the dust cloud, which may be challenging, will be the most difficult aspect of the demolition. Spraying will be used to try to control the dust cloud, but there is no definitive way to do so. The Ministry of Urban Development (MoUD) in a 2012 circular instructed states to construct environmentally appropriate C and D recycling facilities in all cities with a population of above 10 lakh. Additionally, it was said earlier that the Bureau of Indian Standards and Indian Roads Congress shall be responsible for the preparation of a code of practises and standards for the use of recycled materials and products of construction and demolition waste in respect of construction activities, according to the C and D Waste Management Rules, 2016 Rule under the Duties of Bureau of Indian Standards (BIS) and Indian Roads Congress (IRC). According to the Ministry of Environment, Forests and Climate Change, in the case of the “sustainable model” on C and D waste management, the key components are: • Practical estimation of C and D waste generation • Identified sites and timely acquisition of land for development of integrated C and D processing facilities, with necessary approval from local administration / civic bodies • Specifications/standards for recycled C and D waste products for quality acceptance • List and mandate the use of recycled products from C and D wastes • Map water bodies in a city/region – encroachment of water bodies in cities for generating ‘land’ is a common practice observed in several cities • Research on economically viable C and D recycling options • Awareness campaign – tools for sensitisation of general public ​

Humidity plays major role in Delhi's heat wave conditions

New Delhi: Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi's base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: "March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year's data shows, it was drier than average March at about 40 per cent." "March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March," Somvanshi said. "This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March.

Humidity plays major role in Delhi's heat wave conditions

Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi's base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: "March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year's data shows, it was drier than average March at about 40 per cent." The reasons for very low humidity in March are mainly two. "March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March," Somvanshi said. "This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. "Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches," he added. In March, the month starts with generally 60-70 per cent humidity, which decreases to about 40-odd per cent by March end. This year, instead of March end, this 40-point level was reached in mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, 'feels like' temperature - '25 but feels like 35'. This phenomenon happens generally in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD's former director general (meteorology) Ranjan Kelkar said: "February is a winter month and March is supposed to be a summer month. The transition - that usually occurs around the festival of Holi - sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way - cold weather may extend into March or warm weather may fit in early." Kelkar also pointed towards the role of WD and the wind. "In winters, if there is going to be WDs, they come, as the name says, from west side of India - from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. "Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the 'wind' is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry," he said. "The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture," Kelkar said. "In June, as the monsoon approaches, the atmosphere becomes laden with moisture and that is worse because that makes Delhi's atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains."

Humidity plays major role in Delhi’s heat wave conditions

Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi’s base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent.

Humidity plays major role in Delhi’s heat wave conditions

New Delhi: Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi’s base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: “March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year’s data shows, it was drier than average March at about 40 per cent.” The reasons for very low humidity in March are mainly two. “March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March,” Somvanshi said. “This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. “Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches,” he added. In March, the month starts with generally 60-70 per cent humidity, which decreases to about 40-odd per cent by March end. This year, instead of March end, this 40-point level was reached in mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, ‘feels like’ temperature – ’25 but feels like 35′. This phenomenon happens generally in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD’s former director general (meteorology) Ranjan Kelkar said: “February is a winter month and March is supposed to be a summer month. The transition – that usually occurs around the festival of Holi – sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way – cold weather may extend into March or warm weather may fit in early.” Kelkar also pointed towards the role of WD and the wind. “In winters, if there is going to be WDs, they come, as the name says, from west side of India – from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. “Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the ‘wind’ is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry,” he said. “The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture,” Kelkar said. “In June, as the monsoon approaches, the atmosphere becomes laden with moisture and that is worse because that makes Delhi’s atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains.”

Humidity plays major role in Delhi's heat wave conditions

Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi's base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: "March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year's data shows, it was drier than average March at about 40 per cent." The reasons for very low humidity in March are mainly two. "March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March," Somvanshi said. "This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. "Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches," he added. In March, the month starts with generally 60-70 per cent humidity, which decreases to about 40-odd per cent by March end. This year, instead of March end, this 40-point level was reached in mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, 'feels like' temperature - '25 but feels like 35'. This phenomenon happens generally in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD's former director general (meteorology) Ranjan Kelkar said: "February is a winter month and March is supposed to be a summer month. The transition - that usually occurs around the festival of Holi - sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way - cold weather may extend into March or warm weather may fit in early." Kelkar also pointed towards the role of WD and the wind. "In winters, if there is going to be WDs, they come, as the name says, from west side of India - from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. "Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the 'wind' is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry," he said. "The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture," Kelkar said. "In June, as the monsoon approaches, the atmosphere becomes laden with moisture and that is worse because that makes Delhi's atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains."

Humidity plays major role in Delhi's heat wave conditions

Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi's base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: "March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year's data shows, it was drier than average March at about 40 per cent." The reasons for very low humidity in March are mainly two. "March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March," Somvanshi said. "This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. "Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches," he added. In March, the month starts with generally 60-70 per cent humidity, which decreases to about 40-odd per cent by March end. This year, instead of March end, this 40-point level was reached in mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, 'feels like' temperature - '25 but feels like 35'. This phenomenon happens generally in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD's former director general (meteorology) Ranjan Kelkar said: "February is a winter month and March is supposed to be a summer month. The transition - that usually occurs around the festival of Holi - sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way - cold weather may extend into March or warm weather may fit in early." Kelkar also pointed towards the role of WD and the wind. "In winters, if there is going to be WDs, they come, as the name says, from west side of India - from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. "Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the 'wind' is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry," he said. "The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture," Kelkar said. "In June, as the monsoon approaches, the atmosphere becomes laden with moisture and that is worse because that makes Delhi's atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains."

Humidity Plays Major Role In Delhi’s Heat Wave Conditions

Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi’s base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: “March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year’s data shows, it was drier than average March at about 40 per cent.” The reasons for very low humidity in March are mainly two. “March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March,” Somvanshi said. “This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. “Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches,” he added. In March, the month starts with generally 60-70 per cent humidity, which decreases to about 40-odd per cent by March end. This year, instead of March end, this 40-point level was reached in mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, ‘feels like’ temperature – ’25 but feels like 35′. This phenomenon happens generally in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD’s former director general (meteorology) Ranjan Kelkar said: “February is a winter month and March is supposed to be a summer month. The transition – that usually occurs around the festival of Holi – sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way – cold weather may extend into March or warm weather may fit in early.” Kelkar also pointed towards the role of WD and the wind. “In winters, if there is going to be WDs, they come, as the name says, from west side of India – from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. “Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the ‘wind’ is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry,” he said. “The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture,” Kelkar said. “In June, as the monsoon approaches, the atmosphere becomes laden with moisture and that is worse because that makes Delhi’s atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains.”

Humidity plays major role in Delhi’s heat wave conditions

Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi's base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: "March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year's data shows, it was drier than average March at about 40 per cent." The reasons for very low humidity in March are mainly two. "March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March," Somvanshi said. "This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. "Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches," he added. In March, the month starts with generally 60-70 per cent humidity, which decreases to about 40-odd per cent by March end. This year, instead of March end, this 40-point level was reached in mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, 'feels like' temperature - '25 but feels like 35'. This phenomenon happens generally in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD's former director general (meteorology) Ranjan Kelkar said: "February is a winter month and March is supposed to be a summer month. The transition - that usually occurs around the festival of Holi - sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way - cold weather may extend into March or warm weather may fit in early." Kelkar also pointed towards the role of WD and the wind. "In winters, if there is going to be WDs, they come, as the name says, from west side of India - from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. "Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the 'wind' is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry," he said. "The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture," Kelkar said. "In June, as the monsoon approaches, the atmosphere becomes laden with moisture and that is worse because that makes Delhi's atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains."

Humidity plays major role in Delhi’s heat wave conditions

Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi’s base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: “March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year’s data shows, it was drier than average March at about 40 per cent.” The reasons for very low humidity in March are mainly two. “March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March,” Somvanshi said. “This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. “Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches,” he added. In March, the month starts with generally 60-70 per cent humidity, which decreases to about 40-odd per cent by March end. This year, instead of March end, this 40-point level was reached in mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, ‘feels like’ temperature – ’25 but feels like 35′. This phenomenon happens generally in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD’s former director general (meteorology) Ranjan Kelkar said: “February is a winter month and March is supposed to be a summer month. The transition – that usually occurs around the festival of Holi – sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way – cold weather may extend into March or warm weather may fit in early.” Kelkar also pointed towards the role of WD and the wind. “In winters, if there is going to be WDs, they come, as the name says, from west side of India – from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. “Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the ‘wind’ is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry,” he said. “The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture,” Kelkar said. “In June, as the monsoon approaches, the atmosphere becomes laden with moisture and that is worse because that makes Delhi’s atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains.” 20220409-081203

Humidity plays major role in Delhi's heat wave conditions

Starting from mid-March, Delhi-NCR has experienced two heat wave conditions and experts believe that the humidity factor has played a major role. Maximum temperatures above normal over many parts of west-central and north-west India were prevalent for several days leading to the first heat wave from March 11 to 21. The second spell, which started on March 26 and is still underway, is one of the longest for the March-April heat waves. According to data from the India Meteorological Department (IMD), the mean maximum temperature was 32.9 degrees Celsius against its normal value 29.6 degrees, which is 3.3 degrees above the climatological mean for the month. Against the 15.9 mm rainfall for the month, the Safdarjung Observatory, Delhi's base station,recorded zero rainfall in March. Relative humidity for the month hovered around 60-70 per cent in the initial days and lowered down to less than 30 per cent. Avikal Somvanshi, Programme Manager, Urban Analytical Lab at the Centre for Science & Environment, explained: 'March has never been as dry as April, May, and June. March is a transition month. The average humidity in March is 47 per cent. This year's data shows, it was drier than average March at about 40 per cent.' The reasons for very low humidity in March are mainly two. 'March usually has some rainfall because of western disturbance (WD). This year, there has not been any WD. Secondly, there was some anti-cyclonic pressure developed over north India. Because of that there was no WD and as a result, there was unusually low humidity (and therefore, more heat) during March,' Somvanshi said. 'This is an ongoing impact of La Nina. Because of La Nina, we had January as one of the cold and wettest months. And now, this heat in March. 'Usually, the anti-cyclonic development over north India happens in mid-April, because of which temperature increases and humidity decreases. So, the entire north India is dry. But this year, it happened in mid-March itself, so March had unusually low humidity compared to previous Marches,' he added. In March, the month starts with generally 60-70 per cent humidity, which decreases to about 40-odd per cent by March end. This year, instead of March end, this 40-point level was reached in mid-March itself. And April already has low humidity, he said. Humidity has been increasing in north India over the last few years and the combination of high temperature and high humidity increases the heat index; what we call in popular parlance, 'feels like' temperature - '25 but feels like 35'. This phenomenon happens generally in the pre-monsoon period, Somvanshi explained. Agreeing that for Delhi, March is a transition month, IMD's former director general (meteorology) Ranjan Kelkar said: 'February is a winter month and March is supposed to be a summer month. The transition - that usually occurs around the festival of Holi - sometimes is very smooth and sometimes, it is very abrupt. This transition can be either way - cold weather may extend into March or warm weather may fit in early.' Kelkar also pointed towards the role of WD and the wind. 'In winters, if there is going to be WDs, they come, as the name says, from west side of India - from Iran, Iraq, Afghanistan, Pakistan. They bring in moisture, so WD in winters will bring rains in north Indian plains and snow in the upper regions of the Himalayas. 'Another factor is wind. Variations in rainfall are highly localised as it is dependent on local terrain and topography. But when the 'wind' is involved, a large area is influenced by the wind. Dry wind is blowing, then a large part of the country will be dry,' he said. 'The winds are dry (now) as they are not bringing in any moisture. These are southerly winds. In Delhi, April and May are always dry months. Dust storms are common in April and May because there is no moisture,' Kelkar said. 'In June, as the monsoon approaches, the atmosphere becomes laden with moisture and that is worse because that makes Delhi's atmosphere very stuffy. This is the time when Delhi gets thunderstorms with rains.' --IANS