India, Nov. 3 -- Delhi's air quality stayed in the 'very poor' category on Sunday, touching a season high of 388 at 10 am, and the city is expected to record the year's first 'severe' air day this week.

At 4 pm, the average air quality index (AQI) marginally improved as winds picked up speed during the day, registering at 366 at 4pm, when the Central Pollution Control Board (CPCB) released its daily national bulletin. However, at least five individual active ambient air quality stations recorded AQIs in the 'severe' category.

In its daily bulletin, Centre's Air Quality Early Warning System (EWS) said, "Delhi's air quality is very likely to be in the 'very poor' category from Sunday till Monday. The air quality is very likely to be in th...