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  NEW DELHI New Delhi was the world s most polluted capital for the third straight year in 2020, according to IQAir, a Swiss group that measures air quality levels based on the concentration of lung-damaging airborne particles known as PM2.5. India was home to 35 of the world s 50 most polluted cities, according to IQAir s 2020 World Air Quality Report, which gathered data for 106 countries. The findings were based on the country s annual average of particulate matter PM2.5, airborne particles with less than 2.5 microns in diameter. Prolonged exposure to PM2.5 can lead to deadly diseases, including cancer and cardiac problems. In 2020, New Delhi s average annual concentration of PM2.5 in a cubic meter of air was 84.1, the study said, more than double the level of Beijing, which averaged 37.5 during the year, making it the 14th most polluted city in the world.

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