Top 10 Countries with Poor Air Quality: PM2.5 Exposure in 2019

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PM2.5 particulate matter is 2.5 micrometers in diameter or smaller, and can only be seen through an electron microscope. PM2.5 is capable of entering the bloodstream via the lungs. These fine particles are produced from all types of combustion, including motor vehicles, coal-burning power plants, waste burning, residential wood burning, forest fires, agricultural burning, and some industrial processes.