Air Quality in India's Cities 

Average AQI values from December 5th- December 15th, 2017
AQI (Air Quality Index) is a composite index of 5 major pollutants- particulate matter (PM2.5, PM10) sulfur dioxide, carbon monoxide, NO2 and Ozone. The following city profiles display the average of all 24-hour averages over a span of 10 days in 6 major cities in India. 
Given below is the color-coded scale depicting the varying levels of air quality and associated risks to human health. 

Chart: Department of Environmental Protection, West Virginia

Hover over circles to view labels

Data from Central Pollution Control Board http://cpcb.nic.in