Diwali air quality improved by 18.5% compared to last year, while Bengaluru experienced a 25% increase in AQI, shifting from 'satisfactory' to 'moderate'. The city’s air was much cleaner overall on Monday after Diwali, with govt and private trackers showing low pollution numbers. However, firecrackers burst late in the night caused sharp spikes in a. Mumbai AQI improved 18.