Traditional Culture Encyclopedia - Weather forecast - What does pm mean by the Meteorological Bureau?

What does pm mean by the Meteorological Bureau?

PM means particulate matter in English. Meteorologically, the numbers after PM 10 and PM2.5 indicate the diameter of particles, and PM 10 is particles with a diameter less than 10 micron. PM 10 is also called respirable particulate matter. Due to its small diameter, PM2.5 can enter the lungs from the respiratory tract, which is called lung particulate matter.