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近期,被称为“灰霾元凶”的空气污染物PM2.5受到公众广泛的关注,包括上海、南京等许多城市均开始尝试发布PM2.5监测数据.何为PM2.5呢?它是指大气中直径小于或等于2.5微米的颗粒物,也称为可入肺颗粒物,其直径还不到人的头发丝粗细的1/20.与较粗的大气颗粒物相比,PM2.5含有大量的有毒、有害物质,且寿命长、输送距离远,因而对人体健康和大气环境质量的影响更大.
Recently, PM2.5, an air pollutant known as the “haze culprit,” received widespread public concern. Many cities, including Shanghai and Nanjing, are trying to release PM2.5 monitoring data. What is PM2.5? Refers to particles in the atmosphere less than or equal to 2.5 microns in diameter, also known as infiltrating particulates, less than 1/20 the diameter of a human hair.Compared with coarser atmospheric particulates, PM2.5 contains a large amount Of toxic and harmful substances, and long life expectancy, transport distance, and thus greater impact on human health and the quality of the atmospheric environment.