A day after Diwali, while Bengaluru and Mysuru woke up to relatively cleaner air as against cities such as Delhi, Lucknow, Kolkata and Mumbai which saw air quality plummet to 'hazardous' to 'unhealthy' levels.

Delhi was the most polluted major city in India and the world on Tuesday, with an AQI of 567, which is categorised as 'hazardous', as per data from IQAir portal at 9 am.

The major pollutant in the national capital was particulate matter (PM) 2.5 which was measured at 321 µg/m3.

In view of the deteriorating air quality in Delhi, the Commission for Air Quality Management has invoked Stage II of the Graded Response Action Plan (GRAP) across Delhi-National Capital Region.

Under Stage II of GRAP, several curbs and intensified actions are in place, including daily mechanical or vacuum

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