Nearly a third of Indian cities have breached annual pollution limits mandated by the Central Pollution Control Board (CPCB) between 2011 and 2015, according to figures from the Union Environment Ministry-affiliated organisation. The numbers — the latest available and updated in blocks of 4 years — sourced from 680 pollution-monitoring stations spread over 300 cities across the country, measure levels of particulate matter (PM 10), nitrogen dioxide (NO2), and sulphur dioxide (SO2).

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