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PM2.5是英文单词particulate matter的第一个字母的缩写,即细微颗粒物,是对空气中直径小于或等于2.5微米的固体颗粒的通称,约为人类头发直径的三十分之一。PM2.5的第一来源是人为污染,人类既直接排放PM2.5,也排放一些气体污染物,在空气中间接合成PM2.5。燃烧是直接排放的直接途径,在空气中间接转化成PM2.5的气体污染物主要有二氧化硫、氮氧化物、氨气、挥发性有机物,此外,道路扬尘也是PM2.5的重要来源。
PM2.5 is an acronym for the first letter of the particulate matter of the English word particulate matter, a generic term for solid particles less than or equal to 2.5 microns in air, about one-thirtieth of the human hair’s diameter. The first source of PM2.5 is man-made pollution. Mankind not only directly discharges PM2.5, but also emits some gaseous pollutants and indirectly synthesizes PM2.5 in the air. Combustion is the direct way of direct emission. The main pollutants of air pollutants are PM2.5, nitrogen oxides, ammonia, volatile organic compounds. In addition, dust from roads is also an important source of PM2.5.