Current AQI - Particle Pollution(PM2.5)

Nationwide Friday, 05 Nov 2004 See This Map in Motion Yesterday's Animation Map Archives How are the AQI maps calculated? Why is the map not available?

At highest risk from particle pollution are people with heart or lung disease, older adults (possibly because they may have undiagnosed heart or lung disease), and children whose lungs are still developing and who are more likely to have asthma and are more active outdoors.

Particle pollution data are generated using monitoring techniques that approximate the Federal Reference Method. The data are published as soon as practical after the end of each hour and as such are not fully validated. Therefore, data are only approved for the expressed purpose of reporting and forecasting the AQI.