Why do I feel that the sky in Shanghai is gray? Every day.

This cloudy weather is caused by too many particles in the air.

Fine particles are also called particles and fine particles. Particulate matter with a particle size less than or equal to 2μm (sometimes less than 2.5μm, that is, PM2.5) in the atmosphere. Although fine particles are only a few components in the earth's atmosphere, they have an important impact on air quality and visibility. Fine particles have small particle size, contain a lot of toxic and harmful substances, stay in the atmosphere for a long time and have a long transportation distance, which has a great impact on human health and atmospheric environmental quality. 201February, the State Council agreed to issue the newly revised Ambient Air Quality Standard, adding monitoring indicators for fine particles. 20 13 On February 28th, the National Committee for the Examination and Approval of Scientific and Technical Terminology stated that PM2.5 should be officially named as "fine particles".

In order to avoid this situation, the emission reduction of automobiles should be limited. Usually pay more attention, such as wearing a mask when going out, to prevent excessive inhalation of these air pollution from affecting your health, and wash your face and hands frequently. In addition, keep a good mood and avoid being depressed by the weather. To put it bluntly, this kind of weather is not so serious, and it is not so difficult to avoid. I believe that in the future, government departments will implement emission reduction and restriction measures after paying attention to this matter, and the weather will soon get better!