Delhi world’s most polluted city, air quality ‘hazardous’ at 1081 AQI, PM2.5 131 times WHO levels

New Delhi has become the most polluted city in the world after its air quality turns ‘hazardous’ at 1,081 and the concentration of PM2.5 – particulate matter measuring 2.5 microns or less in diameter that can be carried into lungs, causing deadly diseases and cardiac issues – was 130.9 times the WHO’s recommended levels


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