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. PM is typically categorized by size, with PM10 and PM2.5 being the most commonly monitored. PM10 particles are less than 10 micrometers in diameter, while PM2.5 particles are less than 2.5 micrometers. Due to their small size, PM2.5 particles can penetrate deeply into the respiratory tract and pose significant health risks.
