Northern India encountered the recurring annual pre-winter event of air emergency where the Air Quality Index (AQI) readings of main pollutant PM 2.5 breached the 400-mark of “very poor” and landed the air of Delhi, Punjab and other northern cities into the “hazardous” category.

The DSS provides daily estimates for vehicular emissions, while data on stubble burning is typically released the following day.

The air quality index continued to fluctuate between the "severe" and "very poor" categories in Delhi. The city's 24-hour average air quality index, recorded until 4 pm on Sunday, was 318 (very poor),

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Singhu border on November 22 to inspect the implementation of stage IV of the Graded Response Action Plan (GRAP).

Low visibility led to several train delays of 24 to 39 minutes on average. Jansadharan Express from Anand Vihar to Danapur, which was delayed by over 11 hours

Delhi woke up to hazardous smog and severely reduced visibility on Saturday morning as the air quality index (AQI) reached 420, plunging back into the "severe" category. Many areas within the city reported dangerously high pollution levels,

Experts attribute the deteriorating conditions to a mix of vehicular emissions, industrial pollution, and unfavourable weather patterns