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NASA Shares Worrying Images Of US East Coast Engulfed By Smoke From Canadian Wildfires
The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.
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Shocking images of pollution around the world
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Shocking images of India's national capital Delhi breathing toxic air that is equal to smoking 33 cigarettes a day
Air pollution in the city has hit the severe plus category with several parts recording a 1,000 above Air Quality Index (AQI). Right now, stepping out in the Delhi air is equal to smoking 33 ...