India, Dec. 16 -- Delhi's air quality dipped to the 'very poor' category on Tuesday after three straight severe days as fog intensity reduced over the national Capital, aided by an increase in wind speed. Shallow fog was recorded over the national Capital on Tuesday, in contrast to very dense fog on Monday, even as flights continued to be impacted at Delhi's Indira Gandhi International (IGI) airport.

Over 300 flights were delayed at the Delhi airport and at least 126 flights were cancelled, mostly in advance, by multiple airlines on Tuesday.

The 24-hour average air quality Index (AQI) stood at 377 at 8am on Tuesday. It was 427 at 4pm on Monday. The AQI peaked at 461 on Sunday in what was the second worst December air day ever on record....