Focus on local emissions to avoid return of bad air
Rain and improved wind speed after Diwali, which cleared off much of the pollution accumulated due to heavy stubble burning in Punjab and Haryana and the cracker bursting in the city, might have given Delhi the much-needed boost going into the winters when the air quality plunges every year. However, experts cautioned that the authorities must focus on local sources to ensure that city does not slip into an air emergency again. VK Soni, head of India Meteorological Department’s (IMD) environment monitoring research centre, said the western disturbance, which started impacting the western Himalayas on Sunday brought widespread and moderate rains to Delhi-NCR, helping Delhi breathe cleaner air. “The number of stubble fires being spotted over Punjab and Haryana are nearly negligible now. With this western disturbance, two major polluting episodes have been taken care of, which means that now local pollution sources and local weather factors will be the contributors for any kind of change in air quality,” Soni said. Analysis of AQI data shows that on Tuesday for the first time since 2017, Delhi experienced a moderate air quality day between November 13 and 17. Delhi’s average air quality index (AQI) on Tuesday was recorded at 171, in the moderate zone, according to the Central Pollution Control Board (CPCB) data. Also, the contribution of stubble fires in the city’s PM 2.5 levels (ultrafine particulate matter with diameter less than 2.5 micrometres) was just 3%. It had peaked to over 40% in October. Experts said that while sharing a common air shed, pollution coming in from neighbouring states contributes to the air quality deterioration in Delhi, but local factors cannot be ignored. Anumita Roychowdhury, executive director (research and advocacy), Centre for Science and Environment) said that while Delhi has been successful in bending the pollution curve year-after-year, a lot still needs to be done to control pollution, especially in the areas of vehicular emissions and waste management. “There is no denying that work has been done in areas such as controlling industrial emissions and fumes from heavy vehicles crossing the city, etc, but there are still two primary areas where efforts are required. One is reducing vehicular emissions, for which authorities will have to go back to basics and work towards the augmentation of public transport. The situation has become a little tricky now with the limitations due to Covid-19, but this should be a long-term goal for the government,” Roychowdhury said. She added, “Another area where the government needs to concentrate is waste management. In many unauthorised areas there isn’t a proper system to dispose household waste and this waste ultimately ends up being thrown in dhaloas and set ablaze.”
