Particulate Matter (PM) refers to a mixture of solid particles and liquid droplets found in the air. These particles can include dust, dirt, soot, and smoke, and they vary in size. PM is commonly classified into different categories based on size, such as PM10 (particles with a diameter of 10 micrometers or smaller) and PM2.5 (particles with a diameter of 2.5 micrometers or smaller). The smaller the particles, the more dangerous they can be because they can penetrate deeper into the lungs and even enter the bloodstream.
