Delhi woke up to its worst air quality of the season on Tuesday, with the AQI plunging to into the "severe" category at 423.

The Centre invoked stricter anti-pollution measures under Stage III of the Graded Response Action Plan (GRAP) in the wake of the deteriorating air quality.
On Monday, the Central Pollution Control Board's (CPCB) 24-hour average AQI data showed that Delhi's air quality was 'very poor' with an Air Quality Index (AQI) of 362.