According to the weather forecast, after Zhengzhou entered summer, the daily air PM2.5 index was as high as 125. What is this concept?

PM2.5 refers to particles with a diameter less than 2.5 mm in the atmosphere, and 125 refers to particles per cubic centimeter 125.

Inhaling too much of this particulate matter can lead to lung cancer. It is best to wear a mask when going out in Zhengzhou to keep healthy.

There is no summer because of the high temperature, high air pressure and fast airflow, so the particles produced are taken away by the air; On the contrary, the particulate matter produced in winter was not taken away and stayed here, which is also the reason for the smog in Zhengzhou.

Hope to adopt, thank you!