Out of the 56 cites monitored for PM 2.5 by Central Pollution Control Board, the data for the year 2015 indicates that PM 2.5 levels have exceeded permissible limits in Delhi, Bangalore, Bhopal, Gwalior, Singrauli, Angul, Balasore, Rourkela, Sambalpur, Talcher, Kalinga Nagar, Tuticorin, Barrackpore, Durgapur, Howrah and Kolkata.

Source: http://www.indiaenvironmentportal.org.in