How much can pm2.5 run?

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

The normal value of pm2.5 is 75 μ g/m3, and exceeding this value means exceeding the standard.

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

1, excellent 35 μ ug)/ m3

2, good 35~75 micrograms (micrograms)/cubic meter

3. The light pollution is 75~ 1 15 μ ug)/ m3.

4. Moderate pollution 1 15~ 150 μ ug)/ m3.

5, heavy pollution 150~250 micrograms (ug)/ cubic meter.

6, serious pollution of 250 micrograms (ug)/ cubic meter and above.

Fine particles are also called fine particles. Fine particles and PM2.5 fine particles mean that the aerodynamic equivalent diameter in the ambient air is less than or equal to 2.5? Micron particles. It can be suspended in the air for a long time, and the higher its concentration in the air, the more serious the air pollution. 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 the advantages of small particle size, large area, strong activity and easy attachment of toxic and harmful substances (such as heavy metals and microorganisms). ), it 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.

On February 20 13, the Chinese name of PM2.5 was named as fine particles by the National Committee for the Examination and Approval of Technical Terms. The chemical composition of fine particles mainly includes organic carbon (OC), elemental carbon (EC), nitrate, sulfate, ammonium salt and sodium salt (Na? ) and so on.

References:

Baidu encyclopedia -pm2.5