Particulate Matter (PM) refers to a mixture of tiny particles and droplets in the air, including dust, dirt, soot, and smoke. These particles can be composed of various substances such as organic chemicals, metals, and soil or dust particles. PM is categorized based on its size: PM10 (particles with diameters that are 10 micrometers and smaller) and PM2.5 (particles with diameters that are 2.5 micrometers and smaller).
