What's the difference between PM2.5 and PM 10?

The particle size of PM 10 is relatively large, so PM 10 settles and the concentration near the ground is the highest. As the height increases, the concentration will decrease. The particle size of PM2.5 is small, which is easy to be evenly distributed in the air, and it cannot be effectively isolated by ordinary masks and air purifiers.

2. Different definitions

PM 10 refers to respirable airborne suspended particulate matter less than or equal to 10 micron. PM2.5 refers to respirable airborne suspended particles with a diameter less than or equal to 2.5 microns.

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.