Uttar Pradesh’s Ghaziabad was the most polluted city in the country in November, registering an average PM2.5 concentration of 224 micrograms per cubic metre, according to a report by the think tank Centre for Research on Energy and Clean Air .

PM2.5 refers to tiny airborne particles that are about 30 times smaller than the width of a human hair and can easily be breathed into the lungs and the bloodstream.

India’s National Ambient Air Quality Standards prescribe a “safe” PM2.5 limit of 60 μg/m3 (micrograms per cubic metre of air) over a 24-hour period. The World Health Organization prescribes 15 μg/m3.

According to the report released on Friday, Ghaziabad was followed by Noida, Bahadurgarh, Delhi, Hapur, Greater Noida, Baghpat, Sonipat, Meerut and Rohtak in the list of most pollute

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