How much can you run at pm2.5?

Running is mostly aerobic exercise. It is recommended to do it when pm2.5 is normal. Once it exceeds the standard, it is best not to run.

The normal value of pm2.5 is 75 micrograms/cubic meter. If it exceeds this value, it is considered excessive.

In addition, the standard value of the 24-hour average PM2.5 air quality level is:

1. Optimal 35 micrograms (ug)/cubic meter

2. 35~75 micrograms (ug)/per cubic meter

3. Mild pollution 75~115 micrograms (ug)/per cubic meter

4. Moderate pollution 115~150 micrograms ( ug)/per cubic meter

5. Severe pollution 150~250 micrograms (ug)/per cubic meter

6. Severe pollution 250 and above micrograms (ug)/per cubic meter

Fine particulate matter is also called fine particles, fine particles, and PM2.5. Fine particulate matter refers to particulate matter in ambient air with an aerodynamic equivalent diameter of less than or equal to 2.5 microns. It can be suspended in the air for a long time. The higher its concentration in the air, the more serious the air pollution is. Although PM2.5 is only a small component of the earth's atmosphere, it has an important impact on air quality and visibility. Compared with coarser atmospheric particles, PM2.5 has a small particle size, a large area, and strong activity. It is easy to carry toxic and harmful substances (such as heavy metals, microorganisms, etc.), and has a long residence time in the atmosphere and a long transportation distance. Therefore, it has a greater impact on human health and atmospheric environment quality.

In February 2013, the National Scientific and Technical Terms Approval Committee named the Chinese name of PM2.5 as fine particulate matter. The chemical components of fine particulate matter mainly include organic carbon (OC), elemental carbon (EC), nitrate, sulfate, ammonium salt, sodium salt (Na?), etc.

Reference: Baidu Encyclopedia-pm2.5