Pm2.5 is another manifestation of smog, right?

1. Smog: Smog weather is a state of air pollution, and smog is a general manifestation of excessive suspended particulate matter content in the atmosphere. The smog we often talk about is actually a combination of fog and haze, but fog is fog, haze is haze, and fog and haze are very different. Simply put, tiny water droplets in the air are fog, which belongs to liquid, while smog is solid, which consists of tiny dust particles, sulfuric acid, nitric acid, inhalable particles and other particles in the air. It can make the air turbid and reduce visibility, and the combination of the two is smog. The combination of the two, figuratively speaking, is that children play with mud and mix sand with mud and water, which is mixed and dirty.

2.PM 2.5: PM 2.5 refers to particles with a diameter less than or equal to 2.5 microns in the atmosphere, also known as particles that can enter the lungs. Its diameter is less than 1/20 of the thickness of human hair. Although PM2.5 is only a small part of the composition of the earth's atmosphere, it has an important impact on air quality and visibility. Compared with atmospheric coarse particles, PM2.5 has a small particle size, is rich in a large number of toxic and harmful substances, stays in the atmosphere for a long time and has a long transportation distance, so it has a great impact on human health and atmospheric environmental quality.

PM2.5 is only one of the components of smog, and the two are inclusive, not reciprocal. PM2.5 is the main cause of smog. Because PM2.5 particulate matter is the main component of smog, which is the most harmful to human body and the "culprit" leading to smog weather, the key to controlling smog is to solve the PM2.5 problem.

An important source of PM2.5 is automobile exhaust. The deteriorating PM2.5 data will touch people and question their responsibilities in pollution prevention and control, thus reminding more people to drive less and choose green travel more.