Whereas, the AQI in Delhi University sector was 314 while in IIT Delhi it was . The air quality was recorded as 314 in the airport (T3) area. Let us tell you that this kind of deterioration is being seen in the air quality in Delhi even before Diwali. Be aware that an air quality index from 0 to 176 is considered good, while 176 to Moderate, 176 to Poor, 314 to is considered very poor and to 500 or above is considered severe.