PM2.5 refers to very fine air pollution particles with diameters of 2.5 micrometers or smaller, about 3% the width of a human hair. These particles are among the major forms of air pollution and often come from sources such as vehicle emissions, industry, power generation, smoke from cooking and open waste burning. Because they are so small, PM2.5 particles can travel deep into the lungs and even enter the bloodstream. Exposure can increase the risk of asthma, respiratory illness, heart disease, stroke, lung cancer and premature death, especially among children, older adults and other vulnerable groups. This page shows live PM measurements to help people understand current air pollution conditions, identify areas with elevated pollution levels and take precautions when needed and possible.
Waiting for live data. This section will help families decide when to open windows, go outside or reduce exposure.
Waiting for live data. This section will support outdoor play, sports and classroom safety decisions.
Waiting for live data. This section will explain whether running, sports or long outdoor activity is practical.