Air pollution causes health problems and is attributable to some 50,000 annual deaths in the United States, but not all air pollutants pack the same punch.
Scientists have tracked the scope of “PM 2.5” pollution over decades. PM 2.5 is a size of “particulate matter” that is less than 2.5 microns in diameter. But less information was available about its even tinier cousin, described as “submicron” or “PM 1” particulate matter, which is less than 1 micron in diameter. Why does that matter?…
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News Source: www.sciencedaily.com
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