What Is PM2.5
PM2.5 refers to particulate matter smaller than 2.5 micrometers. These tiny particles penetrate deep into lungs and enter the bloodstream. Sources include vehicle exhaust, industrial emissions, and wildfire smoke.
Health Effects
Short-term exposure causes respiratory irritation. Long-term exposure links to heart disease, lung cancer, and stroke. Children, elderly, and those with existing conditions face higher risks.
Reducing Exposure
HEPA filters remove PM2.5 from indoor air. Avoid outdoor exercise when PM2.5 is elevated. N95 respirators provide protection when exposure is unavoidable. Keep vehicle windows closed in traffic.
Monitoring PM2.5
Air quality monitors track PM2.5 levels in real-time. AirNow reports PM2.5 separately from overall AQI. Some smart home devices include air quality sensors. Check levels before and during wildfire season.
