沥青混凝土搅拌站和混凝土铺设过程会产生大量污染物,包括PM2.5。时下提到PM2.5,不少人惶恐不安,但又难以回避。PM2.5是指环境空气中空气动力学当量直径小于等于2.5微米的颗粒物,也称细颗粒物。这些颗粒非常细小,肉眼无法看到,它们可以在空气中漂浮好几天。人类纤细的头发直径大约是70微米,是最大的PM2.5的30倍大。PM2.5的一次来源是污染源直接向环境中排放;二次来源来源于 Asphalt concrete mixing stations and concrete laying process can generate a large number of pollutants, including PM2.5. Mentioned PM2.5 nowadays, many people panic, but difficult to avoid. PM2.5 refers to the air in the aerodynamic equivalent diameter of less than or equal to 2.5 microns of particles, also known as fine particles. These particles are very small and invisible to the naked eye and they can float in the air for days. Human slender hair diameter is about 70 microns, which is 30 times larger than the largest PM2.5. PM2.5 primary source is the source of pollution directly to the environment; second source comes from