AQI tracker: Check out the air quality in key cities todayThe air quality in Delhi on the morning after Diwali was recorded in the 'very poor' category but the situation was relatively better than previous years due to favourable meteorological conditions which diluted the effect of firecrackers and stubble burning. The capital's air quality index (AQI) stood at 326 at 8 am on Tuesday. Let us take a look at air quality in major cities today (Source: CPCB).