Cyclone Ockhi led to a significant drop in pollution levels in the city on Wednesday. After a week of ‘moderate’ air quality, the pollutant measuring indicator — air quality index (AQI) — fell to 43. The AQI level on Wednesday fell under the ‘good’ category, making it the cleanest air day in December since air quality monitoring began in Mumbai in 2015. The cleanest air day this year and since air monitoring began in Mumbai was recorded on October 12, when the AQI was 32 (good). On Wednesday, Chembur had the cleanest air in the city with AQI levels for PM2.5 at 22, while Navi Mumbai had the most polluted air with an AQI of 71.

Source: Hindustan Times December 06, 2017 18:22 UTC