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The Central Pollution Control Board (CPCB) has identified four reasons for the sudden onset of pollution - temperature, wind speed, relative humidity and atmospheric boundary layer - for the worsening Delhi air. (Photo: AFP/Representational)Metros
Pollution level still in 'severe' category as dense smog shrouds Delhi

The air quality is categorised as 'severe', when pollution level hits 401 or above, in the Air Quality Index (AQI).

12 Nov 2017 3:00 PM IST

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