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Harmful Effects of Fine Inhalable Particles

PM 2.5 is made up of tiny particles (smaller than 2.5 micrometers across) that penetrates into the human bloodstream and lungs. It comes from automobile exhaust and dirty power plants, as well as from burning wood and coal. Researchers have estimated that PM 2.5 contributed to 4.2 million deaths worldwide in 2015 alone.
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