Air Quality Index | Region 10 | US EPA

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Air Quality Index

What is the Air Quality Index (AQI)?

The AQI is an index for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health concerns you should be aware of. The AQI focuses on health effects that can happen within a few hours or days after breathing polluted air. EPA uses the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. For each of these pollutants, EPA has established national air quality standards to protect against harmful health effects. You can think of the AQI as a yardstick that runs from 0 to 500. The higher the AQI value, the greater the level of air pollution and the greater the health danger. For more information on the AQI, please click here.

What is the AQI for where I live?

Alaska

Idaho Oregon - (503) 229-6397 Washington You can also check your local newspapers for AQI reports.

Other Air Quality links

Local Navigation


URL: http://yosemite.epa.gov/r10/airpage.nsf/Air+Toxics/AirQual

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