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 (California and Federal).


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


State and Federal Nonattainment Pollutants
Ventura County






Standard Attainment Status

1 Hour


State Nonattainment

8 Hour


State and Federal Nonattainment

Particulate Matter



24 Hour


State Nonattainment

Annual Arithmetic Mean