As of Tuesday morning, six major cities recorded "poor" air quality, four fell into the "moderate" category, four were rated "satisfactory," and only one in the "Good" category, according to data from the Central Pollution Control Board.

Delhi experienced its second consecutive day of hazardous air quality, with an average Air Quality Index (AQI) of 460, categorized as 'severe-plus.' While slightly better than the previous day's record low,

The AQI in Delhi-NCR is in the ‘severe plus’ category. AQI between 0-50 is considered “good”, 51-100 is “satisfactory”, 101-200 is “moderate”, 201-300 is “poor”, 301-400 is “very poor”, 401-500 is “severe” and above 500 is a “severe plus”.

As authorities in Delhi-NCR enforce measures to tackle the deteriorating air quality, here's what you can do to protect yourself.

A 24-hour average Air Quality Index (AQI) of 488 (severe) was recorded at 8am compared to 494 at 4pm on Monday, the joint-second highest ever in the Capital

India, Delhi’s air quality index (AQI) on Tuesday morning stood at 492, which is worse than Monday’s 483. Monday’s 483 AQI was the season’s worst but Tuesday has plummeted further.