The Hindu, New Delhi, Feb 2017: 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).