EMFAC Geographical Areas

EMFAC uses various geographical areas for modeling and reporting purposes. These include Sub-Areas, Counties, Air Basins, Air Districts, and Metropolitan Planning Organizations (MPO). Sub-Areas are defined by the combination of the boundaries of counties, air basins, and air districts. Air Basins are defined as areas with similar meteorological and geographic conditions for the purpose of managing the air resources of the State.

Table 3 defines these geographical areas and their abbreviations as used in EMFAC. The MPO column in Table 3 lists the Metropolitan Planning Organizations (MPO) associated with each geographical area in California:

• AMBAG: Association of Monterey Bay Area Governments

• BCAG: Butte County Association of Governments

• FCOG: Fresno Council of Governments

• KCAG: Kings County Association of Governments

• KCOG: Kern Council of Governments

• MCAG: Merced County Association of Governments

• MCTC: Madera County Transportation Commission

• MTC: Metropolitan Transportation Commission

• SACOG: Sacramento Area Council of Governments

• SANDAG: San Diego Association of Governments

• SBCAG: Santa Barbara County Association of Governments

• SCAG: Southern California Association of Governments

• SRTA: Shasta Regional Transportation Agency

• SJCOG: San Joaquin Council of Governments

• SLOCOG: San Luis Obispo Council of Governments

• StanCOG: Stanislaus Council of Governments

• TCAG: Tulare County Association of Governments

• TMPO: Tahoe Metropolitan Planning Organization (TMPO) and Tahoe Regional Planning Agency (TRPA)

Table 3: Definition of Geographical Areas used in EMFAC

Sub-Area	County	Air Basin	Air District	MPO
Alameda (SF)	Alameda	San Francisco Bay Area	Bay Area AQMD	MTC
Alpine (GBV)	Alpine	Great Basin Valleys	Great Basin Unified APCD
Amador (MC)	Amador	Mountain Counties	Amador County APCD
Butte (SV)	Butte	Sacramento Valley	Butte County AQMD	BCAG
Calaveras (MC)	Calaveras	Mountain Counties	Calaveras County APCD
Colusa (SV)	Colusa	Sacramento Valley	Colusa County APCD
Contra Costa (SF)	Contra Costa	San Francisco Bay Area	Bay Area AQMD	MTC
Del Norte (NC)	Del Norte	North Coast	North Coast Unified AQMD
El Dorado (LT)	El Dorado	Lake Tahoe	El Dorado County AQMD	TMPO
El Dorado (MC)	El Dorado	Mountain Counties	El Dorado County AQMD	SACOG
Fresno (SJV)	Fresno	San Joaquin Valley	San Joaquin Valley APCD	FCOG
Glenn (SV)	Glenn	Sacramento Valley	Glenn County APCD
Humboldt (NC)	Humboldt	North Coast	North Coast Unified AQMD
Imperial (SS)	Imperial	Salton Sea	Imperial County APCD	SCAG
Inyo (GBV)	Inyo	Great Basin Valleys	Great Basin Unified APCD
Kern (MD)	Kern	Mojave Desert	Eastern Kern APCD	KCOG
Kern (SJV)	Kern	San Joaquin Valley	San Joaquin Valley APCD	KCOG
Kings (SJV)	Kings	San Joaquin Valley	San Joaquin Valley APCD	KCAG
Lake (LC)	Lake	Lake County	Lake County AQMD
Lassen (NEP)	Lassen	Northeast Plateau	Lassen County APCD
Los Angeles (MD)	Los Angeles	Mojave Desert	Antelope Valley AQMD	SCAG
Los Angeles (SC)	Los Angeles	South Coast	South Coast AQMD	SCAG
Madera (SJV)	Madera	San Joaquin Valley	San Joaquin Valley APCD	MCTC
Marin (SF)	Marin	San Francisco Bay Area	Bay Area AQMD	MTC
Mariposa (MC)	Mariposa	Mountain Counties	Mariposa County APCD
Mendocino (NC)	Mendocino	North Coast	Mendocino County AQMD
Merced (SJV)	Merced	San Joaquin Valley	San Joaquin Valley APCD	MCAG
Modoc (NEP)	Modoc	Northeast Plateau	Modoc County APCD
Mono (GBV)	Mono	Great Basin Valleys	Great Basin Unified APCD
Monterey (NCC)	Monterey	North Central Coast	Monterey Bay Air Resources District	AMBAG
Napa (SF)	Napa	San Francisco Bay Area	Bay Area AQMD	MTC
Nevada (MC)	Nevada	Mountain Counties	Northern Sierra AQMD
Orange (SC)	Orange	South Coast	South Coast AQMD	SCAG
Placer (LT)	Placer	Lake Tahoe	Placer County APCD	TMPO
Placer (MC)	Placer	Mountain Counties	Placer County APCD	SACOG
Placer (SV)	Placer	Sacramento Valley	Placer County APCD	SACOG
Plumas (MC)	Plumas	Mountain Counties	Northern Sierra AQMD
Riverside (MD/MDAQMD)	Riverside	Mojave Desert	Mojave Desert AQMD	SCAG
Riverside (MD/SCAQMD)	Riverside	Mojave Desert	South Coast AQMD	SCAG
Riverside (SC)	Riverside	South Coast	South Coast AQMD	SCAG
Riverside (SS)	Riverside	Salton Sea	South Coast AQMD	SCAG
Sacramento (SV)	Sacramento	Sacramento Valley	Sacramento Metropolitan AQMD	SACOG
San Benito (NCC)	San Benito	North Central Coast	Monterey Bay Air Resources District	AMBAG
San Bernardino (MD)	San Bernardino	Mojave Desert	Mojave Desert AQMD	SCAG
San Bernardino (SC)	San Bernardino	South Coast	South Coast AQMD	SCAG
San Diego (SD)	San Diego	San Diego	San Diego County APCD	SANDAG
San Francisco (SF)	San Francisco	San Francisco Bay Area	Bay Area AQMD	MTC
San Joaquin (SJV)	San Joaquin	San Joaquin Valley	San Joaquin Valley APCD	SJCOG
San Luis Obispo (SCC)	San Luis Obispo	South Central Coast	San Luis Obispo County APCD	SLOCOG
San Mateo (SF)	San Mateo	San Francisco Bay Area	Bay Area AQMD	MTC
Santa Barbara (SCC)	Santa Barbara	South Central Coast	Santa Barbara County APCD	SBCAG
Santa Clara (SF)	Santa Clara	San Francisco Bay Area	Bay Area AQMD	MTC
Santa Cruz (NCC)	Santa Cruz	North Central Coast	Monterey Bay Air Resources District	AMBAG
Shasta (SV)	Shasta	Sacramento Valley	Shasta County AQMD	SRTA
Sierra (MC)	Sierra	Mountain Counties	Northern Sierra AQMD
Siskiyou (NEP)	Siskiyou	Northeast Plateau	Siskiyou County APCD
Solano (SF)	Solano	San Francisco Bay Area	Bay Area AQMD	MTC
Solano (SV)	Solano	Sacramento Valley	Yolo-Solano AQMD	MTC
Sonoma (NC)	Sonoma	North Coast	Northern Sonoma County APCD	MTC
Sonoma (SF)	Sonoma	San Francisco Bay Area	Bay Area AQMD	MTC
Stanislaus (SJV)	Stanislaus	San Joaquin Valley	San Joaquin Valley APCD	StanCOG
Sutter (SV)	Sutter	Sacramento Valley	Feather River AQMD	SACOG
Tehama (SV)	Tehama	Sacramento Valley	Tehama County APCD
Trinity (NC)	Trinity	North Coast	North Coast Unified AQMD
Tulare (SJV)	Tulare	San Joaquin Valley	San Joaquin Valley APCD	TCAG
Tuolumne (MC)	Tuolumne	Mountain Counties	Tuolumne County APCD
Ventura (SCC)	Ventura	South Central Coast	Ventura County APCD	SCAG
Yolo (SV)	Yolo	Sacramento Valley	Yolo-Solano AQMD	SACOG
Yuba (SV)	Yuba	Sacramento Valley	Feather River AQMD	SACOG