India has 94 cities with toxic air. Half of them in just four states

Low- and middle-income groups are the worst affected by pollution; 92% of deaths due to pollution occurred in that income group

Every third city that failed to meet national air quality standards in India–where most people die of air pollution than any other nation–was in two of the country’s biggest states, Maharashtra and Uttar Pradesh, in five years to 2015, according to government data.

With 17 of 94 cities, Maharashtra had the highest number of cities identified by the Central Pollution Control Board (CPCB) as failing to meet national air-quality standards over five years to 2015, according to this reply to the Lok Sabha (lower house of Parliament) by Mahesh Sharma, minister