India, Nov. 20 -- The air quality index in Delhi is dangerously near the severe mark again, hovering in the 'very poor' category for the seventh consecutive day.

As of 8 am on Thursday, the AQI in the Capital stood at 399, just a point below the 'severe' mark. Meanwhile, 20 air quality monitoring stations in the Capital were above the 'severe' category, with Wazirpur recording the highest AQI at 477. Lodhi Road was registering the best air quality at 272.

The air quality has been deteriorating gradually over the last three days, with the overall AQI being 392 on Wednesday, 374 on Tuesday, and 351 on Monday, according to the CPCB.

The CPCB classifies the air quality as 'good' in the AQI is in the range 0-50, 'satisfactory' between 51 an...