India, Nov. 12 -- Delhi's air quality deteriorated further on Thursday, with the Air Quality Index (AQI) climbing to 323 in the morning and remaining in the 'very poor' category, as calm winds and unfavourable meteorological conditions trapped pollutants close to the ground overnight.

The Central Pollution Control Board's (CPCB) hourly data recorded an AQI of 321 at 7am, which rose to 323 an hour later. This was eight points higher than Wednesday's official daily average of 313.

Of the 57 air quality monitoring stations in the city, IIT-Delhi recorded the worst air quality, with an AQI of 414 in the 'severe' category. The Cantonment station was the only one to record 'moderate' air quality, with an AQI of 128. The remaining stations rep...