“…Cities can be ranked on the basis of different criteria pollutants with different results. Five cities where higher values of air quality index have been observed for the period between November 2015 to October 2016 are Delhi, Faridabad, Varanasi, Lucknow and Jaipur,” Environment Minister Anil Madhav Dave said in a written reply..” The Times of India
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Delhi, Faridabad among 5 cities with worst air pollution: Government