According to the National Air Quality Index provided by the Central Pollution Control Board in ten cities, the prominent pollutant PM 2.5 was hovering between 200 and 500 in cities like Muzaffarpur, Lucknow, Faridabad, Kanpur and Agra.
    
The air quality was rated as 'severe' in Lucknow and Muzaffarpur and 'very poor' in Agra, Kanpur, Pune, Patna and Faridabad. Hyderabad and Chandrapur in Maharashtra recorded
'poor' air quality.

Air quality in Delhi also plunged to 'severe' level following the Diwali celebration with pollutants rising a whopping 20 times in certain areas owing to incessant fireworks and bursting of firecrackers, not withstanding appeals by authorities.

While 'severe' air quality can affects healthy people and seriously impacts those with diseases, air rated as 'very poor' can cause respiratory illness on prolonged exposure."Toxic fume from cracker worsen the killer particles in the air that have already increased by 5 to 7 times than the safe standards. It also deposit deadly chemicals in our environment that will remain trapped for days," the Centre for Science and Environment said.
    
It said, since 2010, average Diwali pollution levels have shown very rapid build-up at least seven to eight times, but peak levels have hit ten times the standard.
    
"This leads to very high exposure that harm health of not only those who suffer from respiratory and cardiac problems but even that of the normal healthy people," the CSE said.

With national capital being the most polluted city, CSE analysis said that November 2015 so far has recorded higher pollution in the city than the same duration last year.

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