Area Designations for 2008 Ground-level Ozone Standards
2008 Ground-level Ozone Standards —
Region 9 Final Designations, April 2012
EPA is implementing the 2008 ozone standards as required by the Clean Air Act. Meeting these standards will provide important public and environmental health benefits. EPA has worked closely with states and tribes to identify areas in the country that meet the standards and those that need to take steps to reduce ozone pollution.
EPAs final designations are based on air quality monitoring data, recommendations submitted by the states and tribes, and other technical information. EPA will work closely with states and tribes to implement the standards using a common sense approach that improves air quality, maximizes flexibilities and minimizes burden on state and local governments.
Map of Final Designations - EPA Region 9
This table identifies area designations for EPAs region 9 states. In some cases EPA designated partial counties. These are identified by a (P). If a county is not listed below, EPA has designated it as unclassifiable/attainment.
EPA Areas for Designations for the 2008 Ozone Standards
| State | Area Name | Counties | Area Classification |
|---|---|---|---|
| American Samoa | Entire territory is unclassifiable/attainment | ||
| Arizona | Phoenix-Mesa, AZ | Maricopa (p) | Marginal |
| Pinal (p) | |||
| Rest of state is unclassifiable/attainment | |||
| California | Calaveras County, CA | Calaveras | Marginal |
| Chico (Butte County), CA | Butte | Marginal | |
| Imperial County, CA | Imperial | Marginal | |
| Kern County (Eastern Kern), CA | Kern (p) | Marginal | |
| Los Angeles-San Bernardino Counties (West Mojave Desert), CA | Los Angeles (p) | Severe | |
| San Bernardino (p) | |||
| Los Angeles-South Coast Air Basin, CA | Los Angeles (p) | Extreme | |
| Orange | |||
| Riverside (p) | |||
| San Bernardino (p) | |||
| Mariposa County, CA | Mariposa | Marginal | |
| Nevada County (Western part), CA | Nevada (p) | Marginal | |
| Riverside County (Coachella Valley), CA | Riverside (p) | Severe | |
| Sacramento Metro, CA | El Dorado (p) | Severe | |
| Placer (p) | |||
| Sacramento | |||
| Solano (p) | |||
| Sutter (p) | |||
| Yolo | |||
| San Diego County, CA | San Diego | Marginal | |
| San Francisco Bay Area, CA | Alameda | Marginal | |
| Contra Costa | |||
| Marin | |||
| Napa | |||
| San Francisco | |||
| San Mateo | |||
| Santa Clara | |||
| Solano (p) | |||
| Sonoma (p) | |||
| San Joaquin Valley, CA | Fresno | Extreme | |
| Kern (p) | |||
| Kings | |||
| Madera | |||
| Merced | |||
| San Joaquin | |||
| Stanislaus | |||
| Tulare | |||
| San Luis Obispo (Eastern San Luis Obispo), CA | San Luis Obispo (p) | Marginal | |
| Tuscan Buttes, CA | Tehama (p) | Marginal | |
| Ventura County, CA | Ventura (p) | Serious | |
| Morongo Areas of Indian Country (Morongo Band of Mission Indians) | Areas of Indian Country | Serious | |
| Pechanga Areas of Indian Country (Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation) | Areas of Indian Country | Moderate | |
| Rest of state is unclassifiable/attainment | |||
| Guam | Entire territory is unclassifiable/attainment | ||
| Hawaii | Entire state is unclassifiable/attainment | ||
| Nevada | Entire state is unclassifiable/attainment | ||
| Northern Mariana Islands | Entire territory is unclassifiable/attainment | ||
Tribal information is available on the Tribal Designations page.
Recommendations from Region 9 States and EPA Responses