Mumbai weather update: With AQI at 176, cityâs air quality improves to 'moderate' category Photo Credit: AFP The air quality in Mumbai move a scaled up to âmoderateâ category on Sunday. For the past few days, it was in the âpoorâ category. According to the System of Air Quality Weather Forecasting And Research (SAFAR), the air quality index (AQI) for all pollutants on Sunday was 176 (moderate) with PM2.5 levels in the moderate category at 83 microgrammes per cubic metre (µg/m3) against the safe limit of 60 µg/m3, and AQI for PM10 at 155 (moderate). An AQI between zero and 50 is considered "good", 51 and 100 "satisfactory", 101 and 200 "moderate", 201 and 300 "poor", 301 and 400 "very poor", and 401 and 500 "severe".