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Air Quality Index (AQI) – A Guide to Air Quality and Your Health

“The AQI is an index for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air. EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide. For each of these pollutants, EPA has established national air quality standards to protect public health. Ground-level ozone and airborne particles are the two pollutants that pose the greatest threat to human health in this country.”

  • AirCompare — Compare the air quality in different U.S. counties.

  • Sign Up for Air Quality Notifications — If you’d like to be advised when the air quality gets into unhealthy ranges, sign up for notifications via email or cell phone.
  • Keep the Air Cleaner — Find out how you can promote cleaner air through transportation, household, and lawn and garden actions.

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