What Are PM10 and PM2.5? Complete Guide to Particulate Matter
PM10 and PM2.5: What Are Particulate Matter? Definition, Sources, Effects & Health Risks Particulate Matter (PM) refers to tiny solid particles or liquid droplets suspended in the air. These particles can come from natural as well as human activities. Because some particles are extremely small, they can enter the respiratory system and affect human health. What Is Particulate Matter? Particulate matter is a mixture of solid particles and liquid droplets present in the atmosphere. These particles vary greatly in size and composition. Common examples include: Dust and soil particles Smoke Soot Aerosols Industrial emissions Vehicle exhaust particles Tiny liquid droplets Particulate matter is commonly classified according to its aerodynamic diameter, such as PM10 and PM2.5. What Is PM10? PM10 refers to particulate matter with an aerodynamic diameter of 10 micrometres (µm) or less. PM10 is often called coarse particulate matter. It can remain suspended in the air or settle o...