认识PM2.5

随着工业的发展，机动车辆的增多，污染物排放和大气颗粒物大量增加，直接导致了大气能见度降低，使得整个城市看起来灰蒙蒙一片。研究表明，大气颗粒物中的PM2．5是能见度降低的主要原因。本文就PM2．5的定义、成分与来源、危害、与能见度的关系、监测技术、相关标准，以及防治手段等进行了介绍。

Understanding PM2.5

With the development of industry and the increase of motor vehicles, the increases of pollutant emissions and atmospheric particulates have been reducing the atmospheric visibility. Researchachievements indicate that PM2.5 is the main cause of reduced visibility. This article introduces different aspects of PM2.5, such as its definition, component and origin, harm, relationship with visibility, monitoringtechnologies, standards and preventing methods.