Air pollution during the three days of Deepavali this year fell by 30.34% compared with the corresponding days in 2019 due to the combined effect of Covid-19 and an apparent reduction in burning of crackers. Data provided by the Karnataka State Pollution Control Board (KSPCB) shows that the average ambient air quality (AQI) of three days — from November 14 to 16 — showed a big drop in the amount of pollutants at seven monitoring stations across the city.