New Delhi: Air quality slipped to the ‘very poor’ category Tuesday in Delhi, a day after the city celebrated Diwali with fervour and gaiety.

Delhi’s average air quality index (AQI) at 7 a.m. was 350, according to the Central Pollution Control Board (CPCB) data. While the AQI remained in the ‘very poor’ zone in most pockets, it shot up to ‘severe’ levels in several neighbourhoods.

In Jahangirpuri, the AQI was 407, Bawana 423, and Wazirpur 408. Show Full Article

The air quality of a region is categorised into six parts in the CPCB scale. When the AQI is between 0 and 50, it is considered ‘good’. It is considered ‘satisfactory’ when the reading ranges between 51 and 100, ‘moderate’ between 101 and 200. The latter part of the CPCB scale categorises an AQI of 201 to 300 as ‘poor’, between

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