New Delhi, Nov. 21 -- Delhi's air quality was on the brink of 'severe' on Thursday as calm winds and low temperature led to stagnation and accumulation of pollutants. A thick haze continued to engulf the city, keeping visibility low and making breathing difficult.

The 24-hour average air quality Index (AQI) stood at 391 (very poor) at 4 pm, when the Central Pollution Control Board releases its daily national bulletin. It was 392 at 4 pm on Wednesday and 374 on Tuesday. The AQI had briefly breached 400 post midnight on Thursday, before marginally dipping during the day.

Forecasts by the Centre's Air Quality Early Warning System (EWS) for Delhi show the capital's AQI is likely to stay 'very poor' on November 21, but should deteriorate to ...