Particulate matter refers to tiny particles in the air that you can’t always see, but you definitely breathe in. These particles are classified by size:

• PM10: Larger particles like dust, pollen, and mold spores
• PM2.5: Fine particles from smoke, cooking, and outdoor pollution (can enter the lungs and bloodstream)

Why it matters: PM2.5 and PM10 can trigger respiratory symptoms, worsen asthma, and increase long-term health risks like heart disease or lung cancer. People with compromised immune systems or chronic illness are especially vulnerable.