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Air Quality Standards

Health-Based Ambient Air Quality Standards

An ambient air quality standard sets legal limits on the level of an air pollutant in the outdoor (ambient) air necessary to protect public health. Both the California Air Resources Board (ARB) and the U.S. Environmental Protection Agency (U.S. EPA) are authorized to set ambient air quality standards.

Click here to view the state and federal ambient air quality standards - Ambient Air Quality Standards Chart (California and Federal)

Ventura County is an attainment area for all standards shown in the “Ambient Air Quality Standards Chart, except the following:

Attainment Status

Pollutant	Standard	National Standard	California Standard
Ozone	1 Hour		Nonattainment
Ozone	8 Hour	Nonattainment	Proposed Nonattainment (ARB hearing scheduled November 2006)
Particulate Matter (PM10)	24 Hour		Nonattainment
Particulate Matter (PM10)	Annual Average		Nonattainment
Particulate Matter (PM2.5)	Annual Average		Nonattainment

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