PM2.5, the full name of English is the particulate matter. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 microns in the atmosphere, also known as lung particles. Its diameter is less than 1/20 of the thickness of a human hair. Although PM2.5 is only a small component of the Earth's atmospheric composition, it has an important impact on air quality and visibility. Compared with coarser atmospheric particulates, PM2.5 has a small particle size, is rich in a large amount of toxic and harmful substances, and has a long residence time in the atmosphere and a long transport distance, thus having a greater impact on human health and the quality of the atmospheric environment.
Respirable particulate matter and total suspended particulate matter in urban air quality daily or weekly reports are two familiar atmospheric pollutants. Respirable particulate matter, also known as PM10, refers to particulate matter that is equal to or less than 10 microns in diameter and can enter the human respiratory system; total suspended particulate matter is also known as PM100, ie, particulate matter having a diameter less than or equal to 100 microns.
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