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Why is it called 2.5? The 2.5 in PM2.5 refers to the size of the pollutant in micrometers. Bear with us here while it gets a bit mathematics-y! Micrometers have this symbol:µm and are equivalent to 0.001 millimeters. The smallest thing that the average human eye can perceive is about 0.1 millimeters, which is * Tcare 10pcs/Lot PM2.5 Activated Carbon Filter Paper for Adults Mouth Face 10Pcs/Lot 5 Layers PM2.5 Activated Carbon Filter Insert 1.The first layer of spunbond can filter micron-level dust 2.The second layer filters industrial pollutants, car exhaust, second-hand smoke and pollen allergens 3.The third layer of activated carbon cloth filters micron-level dust 4.The fourth layer filter smaller materials. 5.The fifth layer of spunbond filters out various harmful substances
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