New Delhi: After Delhi recorded the cleanest October, the city saw its worst November air this year since Central Pollution Control Board (CPCB) started measuring the air quality index (AQI) in 2015. This November witnessed 11 “severe” air quality days, the highest since 2015. The average AQI was 376, beating the previous record of 374 in 2016.
Experts said extended monsoon resulted in high stubble burning counts in the first two weeks of November and meteorological parameters, including low wind speed and low mixing layer height, caused trapping of pollutants from local and regional sources.
CPCB’s data shows that before 2021, November in 2016 was the most polluted with an average AQI of 374 and 10 “severe” days. This November saw three periods when AQI stayed “severe” for three consecutive days each. However, the number of monitoring stations in 2021 is nearly four times more than 2016. In contrast to November, 2021 recorded the cleanest October, including a “good” air quality day, since 2015.
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