City sees ‘moderate’ air spell after 13 days
Gurgaon: The city’s air has been cleaner so far this month compared to Jan, thanks to strong winds that have reduced pollution levels. The AQI was ‘moderate’ from Feb 1 to 8, except on one day — Feb 4 — when it was poor (242). Before the current spell of largely ‘moderate’ AQI, the index was less than 200 on on Jan 18, 13 days ago. Data from the Central Pollution Control Board (CPCB) shows that the average air quality index (AQI) for the first eight days of Feb is 161 (moderate). This is a significant improvement from the previous month, when the average AQI was 251 (poor). The average wind speed in the past eight days has been around 30kmph, which has helped in dispersal of pollutants in the atmosphere, according to experts. But the city has not seen any ‘satisfactory’ or ‘good’ air days so far this year. Jan reported six ‘very poor’ air days, 21 ‘poor’ days and five ‘moderate’ days, while the average wind speed was 13kmph. The month also saw winter at its peak, with the average minimum temperature around 6 degrees Celsius and the maximum at 14 degrees C. There was fog and no sunshine for most of Jan, which also contributed to the slow dispersion of pollutants. “High wind speed in Feb has helped remove pollutants from the atmosphere. Jan also witnessed windy days, but the wind speed was less compared to the initial days of Feb. This month also witnessed rain, which further helped in clearing particulate matter,” said Shubhansh Tiwari, a research associate at the Centre for Science and Environment. Meanwhile, the city’s AQI deteriorated within the ‘moderate’ category on Thursday at 138, from 157 the day before. Teri Gram’s AQI was the highest at 154, followed by Gwalpahari (151), Sector 51 (139) and Vikas Sadan (146). An AQI between zero and 50 is considered ‘good’, 51 and 100 ‘satisfactory’, 101 and 200 ‘moderate’, 201 and 300 ‘poor’, 301 and 400 ‘very poor’, and 401 and 500 ‘severe’. Every year, NCR witnesses heavy smog and deterioration of air quality during winter. The Graded Response Action Plan (GRAP) is implemented every year as a result, with measures including banning of diesel gensets, mechanised cleaning and sprinkling of water on roads and closing down brick kilns, hot-mix plants, stone crushers or any other factory that pushes up air pollution levels. “Air pollution has a direct impact on our health, particularly the lungs. It can result in persistent coughing, stuffy nose and rhinitis. Prolonged exposure to PM2.5 can lead to anxiety, headaches, and migraines. For cardiac patients, irregular heart rhythms and cardiac events are heightened. Abdominal symptoms, such as bloating and gastritis, may also arise,” Dr Kuldeep Kumar Grover, head (critical care and pulmonology) at CK Birla Hospital, said.
