Delhi Air Quality Plummets Ahead Of Diwali, AQI Over 400 In Some Areas

According to the CPCB, an AQI between zero and 50 is classified as good, 51 and 100 as satisfactory, 101 and 200 as moderate, 201 and 300 as poor, 301 and 400 as very poor, and 401 and 500 as severe.