India, Dec. 13 -- A layer of thick smog surrounded Delhi on Saturday morning as the air quality remained at 397 at 9 am, falling in the 'very poor' category, and inching very close to the 'severe' mark.

The 24-hour average air quality index (AQI) at 4 pm on Friday stood in the 'very poor' category at 349, according to the Central Pollution Control Board (CPCB).

While the overall AQI in Delhi remained in the 'very poor' category, it breached the 'severe' mark in major areas of the national capital with readings over 400 at 8 am on Saturday.

Amid the low visibility, Delhi airport issued an advisory informing passengers about low-visibility procedures in progress at the airport. SpiceJet Airlines also issued a separate advisory informing ...