Delhi Air Pollution: Thick Layer Of Fog Engulfs National Capital As AQI Drops To ‘Poor’ Category 19 October 2024 Leave a Comment on Delhi Air Pollution: Thick Layer Of Fog Engulfs National Capital As AQI Drops To ‘Poor’ Category Posted in Blog Share: TwitterFacebookPinterestLinkedin A thick layer of fog engulfed the national capital on Saturday as the overall Air Quality Index (AQI) dropped to 251, categorised as ‘Poor’ by the Central Pollution Control Board.