In what range is the value of pm2.5 index normal?

Good: 35~75 μ g/m3?

Light pollution: 75 ~ 1 15 μ g/m3.

Moderate pollution: 1 15~ 150 μ g/m3?

Heavy pollution: 150~250 μ g/m3?

Serious pollution: more than 250 μ g/m3? And above.

Extended data:

PM2.5 is the main cause of the haze. WHO has pointed out that when the average annual concentration of PM2.5 reaches 35 μ g/m3, the risk of human death is about 10 μ g/m3 higher than that of 15%. Studies have also shown that the higher the concentration of PM2.5, the higher the incidence of respiratory diseases and cardiovascular diseases.

The harm of PM2.5 to human body is so heavy, but most people are kept in the dark, unable to get corresponding tips and guidance, and take effective preventive measures to avoid this harm. This reality obviously violates the government's public service responsibility and the spirit of information disclosure. 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.

Baidu encyclopedia -PM2.5 value