Area Designations for National Ambient Air Quality Standards 8-HOUR OZONE Del Norte
Siskiyou
NORTH COAST
Humboldt
NORTHEAST PLATEAU
Shasta
Trinity
±
Modoc
Tuscan Buttes
Lassen
0
50
100
150
200 Miles
Tehama Mendocino
LAKE COUNTY
Plumas
SACRAMENTO VALLEY
Nevada
Yuba Lake ColusaSutter
Sonoma Napa
SAN FRANCISCO BAY AREA
Yolo
Solano
Marin
San Francisco San Mateo
Placer
Santa Clara
Sac Amador
Merced
Madera
Fresno
SAN JOAQUIN VALLEY Kings
Monterey
SOUTH CENTRAL COAST
GREAT BASIN VALLEYS
Mono
Mariposa
Stanislaus
San Benito
Unclassified/Attainment
Alpine
Calaveras Tuolumne
Santa Cruz
NORTH CENTRAL COAST
LAKE TAHOE
El Dorado
San Contra Joaquin Costa
Alameda
MOUNTAIN COUNTIES
Sierra
Butte
Glenn
Tulare
San Luis Obispo
Kern
Santa Barbara
San Bernardino Ventura
Los Angeles
SOUTH COAST
Orange
Nonattainment
Last Reviewed: December 2015 Air Quality Planning Branch, AQPSD, CARB
SOUTHEAST DESERT
Riverside
Coachella Valley San Diego
Air Basin
County
Antelope Valley and Western Mojave Desert
Inyo
SAN DIEGO
Imperial
Area Designations for State Ambient Air Quality Standards OZONE Del Norte
Siskiyou
NORTH COAST Humboldt
Shasta
Trinity
Modoc
NORTHEAST PLATEAU
Lassen
0
±
50
100
200 Miles
Tehema
SACRAMENTO VALLEY Mendocino
Glenn
Plumas
Butte
Sierra
Colusa Yuba Sutter Lake
LAKE COUNTY
Yolo
Sonoma Napa
SAN FRANCISCO Marin BAY AREA
San Francisco San Mateo Santa Cruz
Solano
Placer
Santa Clara
Sac Amador
Alpine
Calaveras
Tuolumne Mariposa
Stanislaus Merced
Kings
San Luis Obispo
Unclassified Attainment Nonattainment-Transitional
GREAT BASIN VALLEYS
Madera
Monterey
SOUTH CENTRAL COAST
Mono
SAN JOAQUIN Fresno VALLEY
San Benito
NORTH CENTRAL COAST
LAKE TAHOE
El Dorado
San Contra Joaquin Costa
Alameda
MOUNTAIN COUNTIES
Nevada
Inyo
Tulare
Kern
Santa Barbara
San Bernardino Ventura
Los Angeles
SOUTH COAST
Orange
Nonattainment
Air Basin County
Source Date: December 2015 Air Quality Planning Branch, AQPSD
MOJAVE DESERT Riverside
San Diego
SAN DIEGO COUNTY
Imperial
SALTON SEA
Area Designations for National Ambient Air Quality Standards PM10 Del Norte
Siskiyou
Modoc
NORTHEAST PLATEAU
NORTH COAST Humboldt
Shasta
Trinity
Lassen
0
Tehema
SACRAMENTO VALLEY
LAKE COUNTY
Mendocino
Glenn
Yolo
Solano
Nevada
200 Miles
LAKE TAHOE
Placer El Dorado
Sac Amador
Alpine
Calaveras San Tuolumne Contra Joaquin Costa San Francisco Mariposa Alameda Stanislaus Santa San Mateo Clara Merced Madera Santa Cruz San Benito
NORTH CENTRAL COAST
150
MOUNTAIN COUNTIES
Sierra
Colusa Yuba Lake Sutter
SAN FRANCISCO BAY AREA Marin
100
Plumas
Butte
Sonoma Napa
±
50
Fresno
Monterey
SOUTH CENTRAL COAST
Unclassified
Sacramento County
Mono
Mono Basin Mammoth Lake GREAT
BASIN VALLEYS
Inyo
SAN JOAQUIN VALLEY
Kings
Owens Valley
Coso Junction Trona
Tulare
San Luis Obispo
Kern
Santa Barbara
Ventura
Indian Wells Valley
Los Angeles
SOUTH COAST
Orange
Attainment Nonattainment
Air Basin County
Last Reviewed: December 2015 Air Quality Planning Branch, AQPSD, CARB
San Bernardino
SOUTHEAST DESERT
Riverside
Coachella Valley
San Diego
SAN DIEGO COUNTY
Imperial
Area Designations for State Ambient Air Quality Standards PM10 Del Norte
Siskiyou
NORTH COAST Humboldt
LAKE COUNTY
Shasta
Trinity
Modoc
NORTHEAST PLATEAU
±
Lassen
0
Tehema
Mendocino
SACRAMENTO VALLEY
Lake
Colusa
SAN FRANCISCO Marin BAY AREA
San Francisco San Mateo
Sierra
Yuba
Sutter
Yolo Sonoma Napa
Solano
Santa Clara
Santa Cruz
NORTH CENTRAL COAST
Placer
LAKE TAHOE
El Dorado Sac
Alpine
Amador
Stanislaus Merced San Benito
Yosemite NP Mono
GREAT BASIN VALLEYS
Mariposa Madera
SAN JOAQUIN VALLEY Fresno
Monterey
Kings
SOUTH CENTRAL COAST
Attainment
Santa Barbara
Inyo
Tulare
San Luis Obispo
Unclassified
Kern
MOJAVE DESERT Ventura
Los Angeles
SOUTH COAST
Orange
Nonattainment
Air Basin County
Source Date: December 2015 Air Quality Planning Branch, AQPSD
200 Miles
MOUNTAIN COUNTIES
Nevada
Calaveras Contra San Tuolumne Costa Joaquin
Alameda
100
Plumas
Butte
Glenn
50
San Bernardino
Riverside
San Diego
SAN DIEGO COUNTY
Imperial
SALTON SEA
Area Designations for National Ambient Air Quality Standards PM2.5 Del Norte
Siskiyou
±
Modoc
NORTHEAST PLATEAU
NORTH COAST
0
Shasta
Humboldt Trinity
Tehama
LAKE COUNTY
Glenn
Lake Sonoma
SAN FRANCISCO BAY AREA
Sutter
Yuba
Contra Costa San Mateo
Placer
Sacramento
Solano
Marin
Calaveras
Alameda
Stanislaus
Santa Clara
Santa Cruz
LAKE TAHOE Alpine
Amador
Tuolumne
San Joaquin
NORTH CENTRAL COAST
Merced
Monterey
Mono
Mariposa Madera
SAN JOAQUIN VALLEY
SOUTH CENTRAL COAST
Inyo
Tulare
Kings
San Luis Obispo
Nonattainment
GREAT BASIN VALLEYS
Fresno
San Benito
Unclassified/Attainment
Santa Barbara
Kern San Bernardino
Ventura Los Angeles
SOUTH COAST
Orange
Air Basin
SOUTHEAST DESERT
Riverside
San Diego
County
SAN DIEGO COUNTY Last Reviewed: December 2015 Air Quality Planning Branch, AQPSD, CARB
160 Miles
MOUNTAIN COUNTIES
Sierra
El Dorado
Yolo
Napa
120
Plumas
Nevada
Colusa
80
Lassen
SACRAMENTO VALLEY Butte
Mendocino
40
Imperial
Area Designations for State Ambient Air Quality Standards PM2.5 Del Norte
Siskiyou
NORTHEAST PLATEAU
NORTH COAST Humboldt
Shasta
Trinity
Modoc
Lassen
0
Tehema
Mendocino
LAKE COUNTY
SACRAMENTO VALLEY
Lake Sonoma
SAN FRANCISCO Marin BAY AREA
Plumas
Butte
Glenn Colusa
Yuba
Sutter
Yolo Napa
Sac Amador
Alpine
Fresno
Monterey
Mono
GREAT BASIN VALLEYS
SAN JOAQUIN VALLEY
Kings
Inyo
Tulare
San Luis Obispo
County Portion of Federal Ozone AQMA
Kern
Santa Barbara
Ventura
Los Angeles
Unclassified Attainment
SOUTH COAST
Orange
Nonattainment
Air Basin County
Source Date: December 2015 Air Quality Planning Branch, AQPSD
200 Miles
LAKE TAHOE
Placer
El Dorado
SOUTH CENTRAL COAST
100
MOUNTAIN COUNTIES
Nevada
Solano Calaveras San Contra Tuolumne Costa Joaquin San Francisco Alameda Mariposa Stanislaus San Mateo Santa Merced Clara Madera Santa Cruz
NORTH CENTRAL COAST
50
Portola Valley
Sierra
San Benito
±
MOJAVE DESERT San Bernardino Riverside
San Diego
SAN DIEGO COUNTY
Calexico
Imperial
SALTON SEA
Area Designations for National Ambient Air Quality Standards CARBON MONOXIDE Del Norte
Siskiyou
Modoc
±
NORTHEAST PLATEAU
NORTH COAST Humboldt
Shasta
Trinity
0
Lassen
50
100
150
Tehama
Mendocino
SACRAMENTO VALLEY
Lake
LAKE COUNTY
Sonoma
SAN FRANCISCO BAY AREA Marin
Plumas
Nevada
Colusa Yuba Sutter Napa
San Francisco San Mateo
Placer
El Dorado
Yolo Solano
MOUNTAIN COUNTIES
Sierra
Butte
Glenn
Sac Amador
LAKE TAHOE Alpine
Calaveras San Contra Tuolumne Joaquin Costa Alameda Stanislaus Mariposa
Santa Cruz
Santa Clara
Merced
Madera
SAN JOAQUIN
San Benito
NORTH CENTRAL COAST
Fresno VALLEY Kings
Monterey
SOUTH CENTRAL COAST
Unclassified/Attainment
GREAT BASIN VALLEYS
Mono
Inyo
Tulare
San Luis Obispo
Kern
Santa Barbara
SOUTHEAST DESERT Ventura
Los Angeles
SOUTH COAST
Orange
Nonattainment Air Basin
County
Last Reviewed: December 2015 Air Quality Planning Branch, AQPSD, CARB
San Bernardino
Riverside
San Diego
SAN DIEGO COUNTY
Imperial
200 Miles
Area Designations for State Ambient Air Quality Standards CARBON MONOXIDE Del Norte
Siskiyou
NORTH COAST Humboldt
NORTHEAST PLATEAU Shasta
Trinity
Modoc
±
Lassen
0
Tehema
SACRAMENTO VALLEY
LAKE COUNTY Mendocino
Lake Sonoma Marin
SAN FRANCISCO BAY AREA San Francisco
Colusa Yolo Napa
Solano
Contra Costa
Alpine
Calaveras San Tuolumne Joaquin
Santa Cruz
NORTH CENTRAL COAST
LAKE TAHOE
Placer
Sac Amador
Santa Clara
Mariposa
Stanislaus Merced San Benito
Attainment
Nonattainment-Transitional
Text
GREAT BASIN VALLEYS
SAN JOAQUIN VALLEY
Fresno
Monterey
SOUTH CENTRAL COAST
Mono
Madera
Kings San Luis Obispo
Unclassified
Inyo
Tulare
Kern
Santa Barbara
MOJAVE DESERT Ventura
Los Angeles
SOUTH COAST
Orange
Nonattainment Air Basin County
Source Date: December 2015 Air Quality Planning Branch, AQPSD
200 Miles
MOUNTAIN COUNTIES
Nevada El Dorado
Alameda
San Mateo
Sierra
Yuba
Sutter
100
Plumas
Butte
Glenn
50
San Bernardino
Riverside
San Diego
SAN DIEGO COUNTY
Imperial
SALTON SEA
Area Designations for National Ambient Air Quality Standards NITROGEN DIOXIDE Del Norte
Siskiyou
Modoc
NORTHEAST PLATEAU
NORTH COAST Humboldt
Shasta
Trinity
Lassen
Tehema
LAKE COUNTY
Lake Sonoma
Sierra
Butte
SAN FRANCISCO BAY AREA Marin
Yuba Sutter
San Francisco San Mateo
Placer
El Dorado
Yolo Solano
NORTH CENTRAL COAST
150
200 Miles
Sac Amador
LAKE TAHOE
Alpine
Calaveras San Contra Tuolumne Joaquin Costa Alameda Stanislaus Mariposa
Santa Cruz
100
MOUNTAIN COUNTIES
Nevada
Colusa
Napa
50
Plumas
SACRAMENTO VALLEY Mendocino Glenn
0
±
Santa Clara
Merced
GREAT BASIN VALLEYS
Madera
SAN JOAQUIN VALLEY Fresno
San Benito
Kings
Monterey
SOUTH CENTRAL COAST
Mono
Inyo
Tulare
San Luis Obispo
Kern
Santa Barbara
SOUTHEAST DESERT Ventura
Los Angeles
SOUTH COAST
Orange
Unclassified/Attainment
Last Reviewed: December 2015 Air Quality Planning Branch, AQPSD, CARB
Riverside
San Diego
Air Basin
County
San Bernardino
SAN DIEGO COUNTY
Imperial
Area Designations for State Ambient Air Quality Standards NITROGEN DIOXIDE Del Norte
Siskiyou
NORTH COAST Humboldt
NORTHEAST PLATEAU
Shasta
Trinity
Modoc
Lassen
0
Tehema
SACRAMENTO VALLEY Mendocino
LAKE COUNTY
Lake
Colusa
Sutter
SAN FRANCISCO BAY AREA Marin
San Francisco San Mateo
Sac
Solano
Contra Costa
Santa Clara
El Dorado Amador
Alpine
Stanislaus Merced
Nonattainment
GREAT BASIN VALLEYS
Madera
Fresno
SAN JOAQUIN VALLEY
Kings San Luis Obispo
SOUTH CENTRAL COAST
Mono
Mariposa
Monterey
Attainment
Inyo
Tulare
Kern
MOJAVE DESERT
Santa Barbara
Ventura
Los Angeles
SOUTH COAST
Orange
Source Date: December 2015 Air Quality Planning Branch, AQPSD
San Bernardino
Riverside
San Diego
Air Basin County
200 Miles
LAKE TAHOE
Placer
San Benito
NORTH CENTRAL COAST
100
MOUNTAIN COUNTIES
Nevada
Calaveras San Tuolumne Joaquin
Alameda
Santa Cruz
Sierra
Yuba
Yolo Napa Sonoma
50
Plumas
Butte
Glenn
±
SAN DIEGO COUNTY
Imperial
SALTON SEA
Area Designations for National Ambient Air Quality Standards SULFUR DIOXIDE Del Norte
Siskiyou
NORTHEAST PLATEAU
NORTH COAST Humboldt
Shasta
Trinity
LAKE COUNTY
Lake
Yuba Sutter
SAN FRANCISCO BAY AREA Marin
San Francisco San Mateo
Yolo
Nevada Placer
El Dorado
Sac Amador
150
200 Miles
Alpine
Alameda Stanislaus Mariposa Santa Merced Clara
NORTH CENTRAL COAST
100
LAKE TAHOE
Solano San Calaveras Contra Tuolumne Joaquin Costa
Santa Cruz
50
MOUNTAIN COUNTIES
Sierra
Butte
Colusa
Napa Sonoma
0
Plumas
SACRAMENTO VALLEY Glenn
±
Lassen
Tehema
Mendocino
Modoc
Mono
GREAT BASIN VALLEYS
Madera
SAN JOAQUIN VALLEY
San Benito
Fresno
Monterey
SOUTH CENTRAL COAST
Kings
San Luis Obispo
Inyo
Tulare
Kern
Santa Barbara
SOUTHEAST DESERT Ventura Los Angeles San Bernardino
Unclassified Attainment
SOUTH COAST
Orange
Air Basin County
Last Reviewed: December 2015 Air Quality Planning Branch, AQPSD, CARB
Riverside
San Diego
SAN DIEGO COUNTY
Imperial
Area Designations for State Ambient Air Quality Standards SULFUR DIOXIDE Del Norte
Siskiyou
NORTH COAST Humboldt
Shasta
Trinity
± 0
Lassen
50
100
Tehema
SACRAMENTO VALLEY LAKE COUNTY
Modoc
NORTHEAST PLATEAU
Mendocino
Glenn
Lake
Plumas
Butte
Sierra
Colusa Yuba Sutter Yolo
Sonoma Napa
SAN FRANCISCO Marin BAY AREA
MOUNTAIN COUNTIES
Nevada
LAKE TAHOE
Placer El Dorado
Sac Amador
Alpine
Solano Calaveras San Contra Tuolumne Costa Joaquin San Francisco Mariposa Alameda Stanislaus San Mateo Santa Clara Merced Madera Santa Cruz
GREAT BASIN VALLEYS
Fresno
Monterey
Kings
San Luis Obispo
SOUTH CENTRAL COAST
Mono
SAN JOAQUIN VALLEY
San Benito
NORTH CENTRAL COAST
Inyo
Tulare
Kern
Santa Barbara
MOJAVE DESERT Ventura
Los Angeles
SOUTH COAST
Orange
Attainment
Air Basin County
Source Date: December 2015 Air Quality Planning Branch, AQPSD
200 Miles
San Bernardino
Riverside
San Diego
SAN DIEGO COUNTY
Imperial
SALTON SEA
