Delhi world s most polluted city: The report analyses pollution and its health effects from it in more than 7,000 cities around the globe. The analysis was done focusing on two of the most harmful pollutants, fine particulate matter (PM2.5) and nitrogen dioxide (NO 2).
Half of world s cities had PM2 5 levels above least-stringent WHO standards last decade: Report downtoearth.org.in - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from downtoearth.org.in Daily Mail and Mail on Sunday newspapers.