Particulate Matter (PM) refers to a mixture of tiny solid particles and liquid droplets found in the air. These particles can vary in size, shape, and composition, and are classified based on their aerodynamic diameter into PM10 (particles with a diameter of 10 micrometers or less) and PM2.5 (particles with a diameter of 2.5 micrometers or less). PM can originate from various sources, including natural sources like dust storms and anthropogenic activities such as vehicle emissions, industrial processes, and residential heating.
