Mojave Desert

San Joaquin Valley

Northeast Plateau

South Coast

NorthCoast SacramentoValley

GreatBasinValleys

MountainCounties

Salton Sea

South Central Coast

North Central Coast

San DiegoCounty

San Francisco Bay

LakeCounty Lake Tahoe

C a l i f o r n i aC a l i f o r n i a

N e v a d aN e v a d a

A r i z o n aA r i z o n a

Nye

Elko

InyoCoconino

Pima

Mohave

Kern

ClarkApacheNavajo

Lincoln

San Bernardino

Gila

Pinal

Yavapai

Maricopa

Humboldt

Yuma

Fresno

White Pine

Washoe

Lander

Riverside

Tulare

Cochise

Siskiyou

La Paz

PershingLassen

Modoc

Eureka

Graham

Mono

Shasta

Imperial

Churchill

Mineral

Trinity

San Diego

Lyon

Tehama

Monterey

Plumas

Esmeralda

Mendocino

Los Angeles

Butte

Madera

Lake

Merced

Kings

Placer

Ventura

Tuolumne

Yolo

Glenn

Sonoma El Dorado

Santa Barbara

Colusa

Sierra

Mariposa

NapaSolano

Alpine

Santa Cruz

Greenlee

San Luis Obispo

Stanislaus

Nevada

San Benito

Yuba

San Joaquin

Santa Clara

Orange

Del Norte

Calaveras

Sutter

Marin

Douglas

Alameda

SacramentoAmador

Contra Costa

San Mateo

StoreyCarson City

San Francisco

0 50 10025 Miles

Sources: EPA (2010),ESRI (2006), TANA (2006).

CALIFORNIA AIR BASINSAND COUNTIES IN EPA REGION 9

AIR1000059_1 18 November 2010

Hawaii

Maui

Oahu

Kauai

Molokai

LanaiKahoolaweH a w a i iH a w a i i