Delhi has recorded severe air quality on five of the last seven days after Diwali. The city recorded the Air Quality Index (AQI) at 454 at 9 am. The 24-hour average AQI was 411 on Thursday. In November, such conditions in Delhi are usual. High humidity, low wind speed has led to this coverage of smog. All the stations are in the Red category. A few have AQI even more than 700 like Wazirpur and Jahangirpuri. Watch the video to know more.