Less than desirable Air Quality Index (AQI) figures were recorded on about 80 per cent of days since November 1, with the AQI in the moderate (yellow) category on 21 days. In comparison, despite Diwali, October reported only 13 days of AQI in the yellow, with the Laxmi Poojan day seeing an AQI in the poor (orange) category.

The main pollutants are ozone, NO2, PM2.5, and PM10, according to data from the Central Pollution Control Board, assessed by mid-day. Last year, November recorded an AQI in the moderate category on 28 days and Poor on two days. Mumbai reported an average AQI of 126 on Thursday, 167 on Wednesday, 198 on Tuesday, and 168 on Monday this week. Between November 1 and November 6, Mumbai reported an AQI in the good and average category, under 100.