1.定义和主要来源:可吸入颗粒物对人的影响要大于其他任何污染物。它的主要组成成分是硫酸盐、硝酸盐、氨、氯化钠、黑碳、矿物粉尘和水。它包括悬浮在空气中的有机和无机物的固体和液体复杂混合物。最有损健康的是直径10微米或更小的颗粒物(≤PM_(10)),能渗透并深深嵌入肺部。长期暴露于这些颗粒物可能导致罹息心血管和呼吸道疾病,以及肺癌。对空气质量测量的报告通常涉及日常或年平均每立方 1. Definitions and main sources: Respirable particulate matter affects humans more than any other pollutant. Its main components are sulfate, nitrate, ammonia, sodium chloride, black carbon, mineral dust and water. It consists of a complex mixture of solids and liquids suspended in air, organic and inorganic. The most detrimental to the health of particles 10 microns or less in diameter (≤ PM_ (10)), can penetrate and deeply embedded in the lungs. Prolonged exposure to these particulates can result in cardiovascular and respiratory disease, as well as lung cancer. Reports of air quality measurements usually involve daily or annual average cubic meters