Delhi residents woke up on Tuesday to heavy grey haze darkening the city skies, reduced visibility and the air quality in the 'red zone' after many celebrated Diwali last night by bursting firecrackers beyond the two-hour limit set by the Supreme Court.

According to a Central Pollution Control Bureau (CPCB) bulletin, Delhi's Air Quality Index (AQI) was 'very poor', with a reading of 352 at 8 am. It was 346 at 5 am, 347 at 6 am and 351 at 7 am.

An AQI between 0 and 50 is 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.

Related news: ‘What to expect from a CM who can’t even pronounce AQI’: AAP Delhi chief on pollution after Diwali

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