U.S. Air Quality Report
Local weather | Tree Pollen | Grass Pollen | Weed Pollen
Local weather | Tree Pollen | Grass Pollen | Weed Pollen
The Air Quality Index is a measure of five major air pollutants calculated by the Environmental Protection Agency. The Clean Air Act regulates ground-level ozone, carbon monoxide, sulfur dioxide and nitrogen dioxide and particle pollution - also called particulate matter. The AQI measures these pollutants in a range from zero to 500. Anything above 100 on the scale (to the right of the yellow MODERATE level) represents a health concern, according to the EPA. Learn more at the AIRNow Web site.
SOURCE: AIRNow, a cross-agency U.S. Government Web site
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