EMFAC2011-PL

User’s Guide

December 20, 2012
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EMFAC2011-PL

1.0 INTRODUCTION

EMFAC2011-PL (Ver 1.1) is a new simplified tool that reports emission rates for project-level assessments. EMFAC-PL

uses emissions and activity data from EMFAC2011-SG module inventory files (which consists of the default inventories of

the two EMFAC modules, i.e. EMFAC-LDV and EMFAC-HD) to back-calculate default emission rates. The EMFAC-PL 

tool also reports effective CO2 emissions with Pavley-I and Low Carbon Fuel Standard (LCFS) benefits. EMFAC2011-PL

is developed on the Microsoft® Access platform, and generates outputs in Microsoft Excel format (*.xls).

EMFAC2011-PL processes data at a sub-area level (area defined by County-Air Basin-District boundaries [CoABDis] or 

Geographic Area Index [GAI]). Therefore, in order to process regional scenarios (State, Air Basin, Air District, MPO, 

County), the tool processes all sub-areas in its domain and aggregate the results. That is, for a single “Statewide” 

regional modeling scenario, the model will aggregate the emission rates of all 69 sub-areas. Similar to EMFAC2011-SG, 

the EMFAC2011-PL tool allows users to generate MPO-level outputs in addition to the Statewide, Air Basin, Air District, 

County, and Sub-Area level outputs common in EMFAC2007. 
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2.0 MODEL OPERATION AND LOGIC

Since the fleet characteristics (vehicle type, technology, and age distributions) and vehicle use patterns (vehicular miles 

travelled or VMT, and speed) vary by local regulatory and planning agencies, the vehicle usage and speed profiles vary 

greatly at the sub-area level (GAI or CoABDis). The EMFAC-PL tool processes emission factors at the sub-area level, 

and then aggregate the data at the desired regional level. 

EMFAC-PL uses the combined outputs from the two models (EMFAC-LDV and EMFAC-HD) at the most detailed level 

(i.e. EMFAC “Burden” output level) disaggregated by Speed (5-MPH increments) as the base inventory. When a user 

models a scenario, the EMFAC-PL tool imports the data from the corresponding base inventory file, and disaggregates 

the data into different parameters. 

Based on the modeling parameters, the EMFAC-PL tool uses the following equations to calculate the emission rates by 

Vehicle Category (VC) for the EMFAC2011 vehicle categories:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 (

 

 )
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Idling Emission Rates for HD vehicles were obtained from the HD Idling Database at the Sub-Area level 

(http://www.arb.ca.gov/msei/emfac2011_idling_emission_rates.xlsx), and aggregated at the 15 Air Basins and at the 

statewide total levels using population-weighted aggregation. If the user selects the aggregated “California” option, then 

the statewide data for the corresponding calendar year and season are looked up. For every other region, an analysis of 

the Air Basin of largest influence was conducted using the 1990 default populations. Depending on the region selected by 

the user in EMFAC-PL tool, the tool looks up the Air Basin with the largest influence, and assigns the HD Idling Emission 

Rates. For example, Los Angeles County lies in two Air Basins: South Coast Air Basin and the Mojave Desert Air Basin. 

However, since over 97% of the vehicles registered in the LA County were in the South Coast Air Basin, the SCAB HD 

Idling Emission Rates were assigned to LA County. The HD Idling Lookup Table is presented in Appendix C.

The EMFAC2011 vehicle category scheme is the most detailed scheme used by the model. For other aggregated vehicle 

category schemes (EMFAC2007, Truck/Non-Truck, ALL vehicles), the tool uses similar weighted-aggregation to calculate 

the process emission rates, except when calculating running emission factors. When the EMFAC2011 vehicle categories 

are aggregated up to a higher category scheme for running emission rates, the factors are weighted using the total VMT 

contribution of the EMFAC2011 vehicle to the newly aggregated category. That is, if the user selects the “Truck/NonTruck” category scheme for a scenario where ‘LDA-GAS’ has a total VMT contribution of 35% to the ‘Non-Trucks’ 

category, then all the speed bins for the ‘Non-Trucks’ category will contain 35% of the emission factors from ‘LDA-GAS’. 

In other words, it assumes that when a standard fleet with a constant fleet composition moves at two different speeds 

(e.g. 35 MPH in one leg of the project, and 50MPH in the another leg), it should have identical contributions from all the 

constituents. This way, the EMFAC-PL tool is able to accurately calculate consistent fleet-wide average emission factors

at all speeds which are needed for project-level assessments. 

Note: The Web Database uses VMT contributions by speed to aggregate the emission rates for Medium-Heavy and 

Heavy-Heavy Duty Trucks in the EMFAC2007 category scheme (MHDT and HHDT). Since each vehicle class is

operated on different road type, speed limits, time of day, day of week, etc., the VMT contribution profiles for vehicles at 

different speed bins can be different from their total VMT contribution profile. Therefore, for MHDT and HHDT vehicles in 

EMFAC2007 scheme, the aggregation method in the Web Database may produce different emission factors from the 

EMFAC2011-PL tool. Although the emission factors from the web database are consistent with the planning inventories, 

they may not be the most suitable representation of fleet-wide average emission factors at different speeds for projectlevel analyses for those vehicles (MHDT, HHDT).
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3.0 MODEL EXTRACTION

1. Extract the “EMFAC2011-PL (Ver 1.1).zip” file to the root C drive (“C:\”)

2. The process will create a folder on the root C Drive called “EMFAC2011-PL (Ver 1.1)” and will contain the 

“EMFAC2011-PL (Ver 1.1).mdb” file

4.0 SYSTEM REQUIREMENTS

The EMFAC2011-PL (Ver 1.1) tool requires Microsoft XP or a more recent operating system; and Microsoft Access and 

Excel 2003 or newer to run the tool. 

EMFAC2011-PL also requires that EMFAC2011-SG (Ver 1.1) is installed on the user’s computer since the PL tool uses 

the inventory files from the SG module.
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5.0 MODEL INSTALLATION (FIRST TIME USER) 

EMFAC2011-PL (Ver 1.1) contains Visual Basic for Applications (VBA) code for processing the data. Therefore, first time 

users may get a “Security Warning” depending on their system’s “Security Settings”. If such an error message is 

received, follow the steps described below to enable the modeling processors.

5.1 MICROSOFT® OFFICE 2007/2010 USERS:

1. Open the file <C:\EMFAC2011-PL (Ver 1.1)\EMFAC2011-PL (Ver 1.1).mdb>

2. Microsoft® Office 2007/2010 users may receive a yellow notification ribbon at the top:

“Security Warning – Some active content has been disabled. Click for more details.”
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3. If the “Enable Content” button appears, click ‘Enable Content’ button to complete the installation procedure

If the ‘Enable Content’ button doesn’t appear, then follow these steps:

4. Click ‘File’ to reach Microsoft Access Menu 

5. Click ‘Privacy Options’ to reach Microsoft Access Options

6. Access Options will open up
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7. Click on ‘Trust Center’ button
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8. Trust Center Options will open up

9. Click on ‘Trust Center Settings...’ button
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10.Click on ‘Trusted Locations’ option

11.Click on ‘Add new location’ button
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12.Microsoft Office Trusted Location window will open up

13.Type “C:\EMFAC2011-PL (Ver 1.1)” in the ‘Path’ field 

o Click ‘OK’

14.Click ‘OK’ on all previous messages boxes, and continue

15.Access will require closing and re-opening the EMFAC2011-PL database for options to take effect

16.Close the PL Tool to complete the installation procedure
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5.2 MICROSOFT® OFFICE 2003 USERS:

1. Double Click on the <EMFAC2011-PL (Ver 1.1).mdb> file to open it

2. First time users using Microsoft® Office 2003 may get a Security Warning for authorizing the digital signature “AV 

ARB”:

If the ‘Always trust files from this publisher and open the automatically’ option is available, check the option and 

click ‘Open’

(If the check box is checked, the following steps need not be completed)

3. Click on the ‘Details’ button
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4. The ‘Digital Signature Details’ for the digital signature “AV ARB” will open up

5. Click the ‘View Certificate’ button
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6. The ‘Certificate Information’ will open up for the digital signature “AV ARB”

7. Click ‘Install Certificate’ button to install the digital signature “AV ARB”
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8. The ‘Certificate Import Wizard’ will open

9. Click ‘Next’
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10.Select ‘Automatically select the certificate store based on the type of certificate’, and click ‘Next’
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11.Click ‘Finish’
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12.A final security warning will be displayed. Click ‘Yes’

13.Click ‘OK’
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14.The Security Warning will show again, and the ‘Always trust files from this publisher and open the automatically’ 

option will be available. Check the option (to authorize MS Access documents with the digital signature “AV ARB”) 

and click ‘Open’
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6.0 TOOL OPERATION

Open the file < C:\EMFAC2011-PL (Ver 1.1)\EMFAC2011-PL (Ver 1.1).mdb>
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6.1 INPUT DATA ELEMENTS

EMFAC2011-PL has eight main inputs:

 Vehicle Category Scheme:

o EMFAC2011 Scheme 

o EMFAC 2007 Scheme 

o Truck / Non-Truck Scheme 

o Truck 1 / Truck 2 / Non-Truck Scheme

o ALL Combined

 Region type

o Statewide Average 

o Air Basin 

o Air District 

o MPO 

o County 

o Sub-Area (CoABDis or GAI)

 Region

 Calendar year

o Any calendar year between 1990 and 2035

 Season

o Annual

o Summer

o Winter

 Vehicle (based on the Vehicle Category Scheme selected)

 Fuel Technology (GAS, DSL, TOT, or ALL)

 Speed

o Speeds from 5 - 70 MPH at 5 MPH increments
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7.0 MODEL OUTPUTS

The model outputs are denoted by “EMFAC2011-PL Output” and contain the region, calendar year, and season title 

identifiers in the filename. The output files are created in Microsoft® Excel format (.xls), and contain the following 

worksheets:

 Running Exhaust Emissions Rates [RUNEX] in g/mile/veh

 Idling Exhaust Emissions Rates [IDLEX] in g/hr/veh

 Starting Exhaust Emissions Rates [STREX] in g/trip/veh

 PM Brake Wear [PMBW] and PM Tire Wear [PMTW] in g/mile/veh

 Evaporative Emission Rates in g/veh/day

o Diurnal Emissions [DIURN]

o Hot Soak Emissions [HTSK]

o Running Loss Emissions [RUNLS]

o Resting Loss Emissions [RESTL]

 Readme file

The following data are generated in each table:

o TOG Emissions

o ROG Emissions

o CO Emissions

o NOx Emissions

o CO2 Emissions

o CO2 Emissions (including Pavley I and LCFS adjustments)

o PM10 Emissions

o PM2.5 Emissions

o SOx Emissions
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The following process emissions are generated for each pollutant:

o All Pollutants - Running Exhaust, Idling Exhaust, Starting Exhaust

o ROG and TOG - Diurnal Losses, Hot-Soak Losses, Running Losses, Resting Losses 

o PM10 and PM2.5 - Brake wear, Tire wear
Appendix A – Sub-Area Classification

Sub-Area County Air Basin Air District MPO

Alameda (SF) Alameda San Francisco Bay Area Bay Area AQMD MTC

Alpine (GBV) Alpine Great Basin Valley 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 APCD TMPO

El Dorado (MC) El Dorado Mountain Counties El Dorado County APCD SACOG

Fresno (SJV) Fresno San Joaquin Valley San Joaquin Valley Unified APCD COFCG

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 Valley Great Basin Unified APCD

Kern (MD) Kern Mojave Desert Kern County APCD KCOG

Kern (SJV) Kern San Joaquin Valley San Joaquin Valley Unified APCD KCOG

Kings (SJV) Kings San Joaquin Valley San Joaquin Valley Unified APCD KCAG

Lake (LC) Lake Lake County Lake County APCD

Lassen (NEP) Lassen Northeast Plateau Lassen County APCD

Los Angeles (MD) Los Angeles Mojave Desert Antelope Valley APCD SCAG

Los Angeles (SC) Los Angeles South Coast South Coast AQMD SCAG

Madera (SJV) Madera San Joaquin Valley San Joaquin Valley Unified 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 APCD

Merced (SJV) Merced San Joaquin Valley San Joaquin Valley Unified APCD MCAG

Modoc (NEP) Modoc Northeast Plateau Modoc County APCD

Mono (GBV) Mono Great Basin Valley Great Basin Unified APCD

Monterey (NCC) Monterey North Central Coast Monterey Bay Unified APCD 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 Unified APCD 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 Unified 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 Unified APCD AMBAG

Shasta (SV) Shasta Sacramento Valley Shasta County AQMD SCRTPA

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 Unified 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 Unified 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
Appendix B – EMFAC2011 Vehicle Category Classification

Index EMFAC2011 Veh & Tech EMFAC2011 Vehicle Description Source EMFAC2007 

Vehicle

Truck / 

Non-Truck 

Category

Truck 1 /

Truck 2 / 

Non-Truck

Category

1 LDA - DSL

LDA Passenger Cars

EMFAC-LDV

LDA

Non-Trucks Non-Trucks

2 LDA - GAS EMFAC-LDV Non-Trucks Non-Trucks

3 LDT1 - DSL

LDT1 Light-Duty Trucks (0-3750 lbs)

EMFAC-LDV

LDT1

Non-Trucks Non-Trucks

4 LDT1 - GAS EMFAC-LDV Non-Trucks Non-Trucks

5 LDT2 - DSL

LDT2 Light-Duty Trucks (3751-5750 lbs)

EMFAC-LDV

LDT2

Non-Trucks Non-Trucks

6 LDT2 - GAS EMFAC-LDV Non-Trucks Non-Trucks

7 LHD1 - DSL

LHD1 Light-Heavy-Duty Trucks (8501-10000 lbs)

EMFAC-LDV

LHDT1

Trucks Truck 1

8 LHD1 - GAS EMFAC-LDV Trucks Truck 1

9 LHD2 - DSL

LHD2 Light-Heavy-Duty Trucks (10001-14000 

lbs)

EMFAC-LDV

LHDT2

Trucks Truck 1

10 LHD2 - GAS EMFAC-LDV Trucks Truck 1

11 MCY - GAS MCY Motorcycles EMFAC-LDV MCY Non-Trucks Non-Trucks

12 MDV - DSL

MDV Medium-Duty Trucks (5751-8500 lbs)

EMFAC-LDV

MDV

Non-Trucks Non-Trucks

13 MDV - GAS EMFAC-LDV Non-Trucks Non-Trucks

14 MH - DSL

MH Motor Homes

EMFAC-LDV

MH

Non-Trucks Non-Trucks

15 MH - GAS EMFAC-LDV Non-Trucks Non-Trucks

16 T6 Ag - DSL T6 Ag Medium-Heavy Duty Diesel Agriculture 

Truck EMFAC-HD

MHDT

Trucks Truck 2

17 T6 CAIRP heavy - DSL T6 CAIRP heavy

Medium-Heavy Duty Diesel CA 

International Registration Plan Truck with 

GVWR>26000 lbs

EMFAC-HD Trucks Truck 2

18 T6 CAIRP small - DSL T6 CAIRP small

Medium-Heavy Duty Diesel CA 

International Registration Plan Truck with 

GVWR<=26000 lbs

EMFAC-HD Trucks Truck 2

19 T6 instate construction 

heavy - DSL

T6 instate 

construction heavy

Medium-Heavy Duty Diesel instate 

construction Truck with GVWR>26000 lbs EMFAC-HD Trucks Truck 2

20 T6 instate construction 

small - DSL

T6 instate 

construction small

Medium-Heavy Duty Diesel instate 

construction Truck with GVWR<=26000 

lbs

EMFAC-HD Trucks Truck 2

21 T6 instate heavy - DSL T6 instate heavy Medium-Heavy Duty Diesel instate Truck 

with GVWR>26000 lbs EMFAC-HD Trucks Truck 2

22 T6 instate small - DSL T6 instate small Medium-Heavy Duty Diesel instate Truck 

with GVWR<=26000 lbs EMFAC-HD Trucks Truck 2

23 T6 OOS heavy - DSL T6 OOS heavy Medium-Heavy Duty Diesel Out-of-state 

Truck with GVWR>26000 lbs EMFAC-HD Trucks Truck 2

24 T6 OOS small - DSL T6 OOS small Medium-Heavy Duty Diesel Out-of-state 

Truck with GVWR<=26000 lbs EMFAC-HD Trucks Truck 2

25 T6 Public - DSL T6 Public Medium-Heavy Duty Diesel Public Fleet 

Truck EMFAC-HD Trucks Truck 2

26 T6 utility - DSL T6 utility Medium-Heavy Duty Diesel Utility Fleet 

Truck EMFAC-HD Trucks Truck 2

27 T6TS - GAS T6TS Medium-Heavy Duty Gasoline Truck EMFAC-LDV Trucks Truck 2

28 T7 Ag - DSL T7 Ag Heavy-Heavy Duty Diesel Agriculture 

Truck EMFAC-HD

HHDT

Trucks Truck 2

29 T7 CAIRP - DSL T7 CAIRP Heavy-Heavy Duty Diesel CA International 

Registration Plan Truck EMFAC-HD Trucks Truck 2

30 T7 CAIRP construction -

DSL

T7 CAIRP 

construction

Heavy-Heavy Duty Diesel CA International 

Registration Plan Construction Truck EMFAC-HD Trucks Truck 2

31 T7 NNOOS - DSL T7 NNOOS Heavy-Heavy Duty Diesel NonNeighboring Out-of-state Truck EMFAC-HD Trucks Truck 2

32 T7 NOOS - DSL T7 NOOS Heavy-Heavy Duty Diesel Neighboring 

Out-of-state Truck EMFAC-HD Trucks Truck 2

33 T7 other port - DSL T7 other port Heavy-Heavy Duty Diesel Drayage Truck 

at Other Facilities EMFAC-HD Trucks Truck 2

34 T7 POAK - DSL T7 POAK Heavy-Heavy Duty Diesel Drayage Truck 

in Bay Area EMFAC-HD Trucks Truck 2

35 T7 POLA - DSL T7 POLA Heavy-Heavy Duty Diesel Drayage Truck 

near South Coast EMFAC-HD Trucks Truck 2

36 T7 Public - DSL T7 Public Heavy-Heavy Duty Diesel Public Fleet 

Truck EMFAC-HD Trucks Truck 2

37 T7 Single - DSL T7 Single Heavy-Heavy Duty Diesel Single Unit 

Truck EMFAC-HD Trucks Truck 2

38 T7 single construction -

DSL T7 single construction Heavy-Heavy Duty Diesel Single Unit Construction Truck EMFAC-HD Trucks Truck 2

39 T7 SWCV - DSL T7 SWCV Heavy-Heavy Duty Diesel Solid Waste 

Collection Truck EMFAC-HD Trucks Truck 2

40 T7 tractor - DSL T7 tractor Heavy-Heavy Duty Diesel Tractor Truck EMFAC-HD Trucks Truck 2

41 T7 tractor construction -

DSL

T7 tractor 

construction

Heavy-Heavy Duty Diesel Tractor 

Construction Truck EMFAC-HD Trucks Truck 2

42 T7 utility - DSL T7 utility Heavy-Heavy Duty Diesel Utility Fleet 

Truck EMFAC-HD Trucks Truck 2

43 T7IS - GAS T7IS Heavy-Heavy Duty Gasoline Truck EMFAC-LDV Trucks Truck 2

44 PTO - DSL PTO Power Take Off EMFAC-HD Trucks Truck 2

45 SBUS - DSL

SBUS

School Buses EMFAC-HD

SBUS

Non-Trucks Non-Trucks

46 SBUS - GAS School Buses EMFAC-LDV Non-Trucks Non-Trucks

47 UBUS - DSL

UBUS Urban Buses

EMFAC-LDV

UBUS

Non-Trucks Non-Trucks

48 UBUS - GAS EMFAC-LDV Non-Trucks Non-Trucks

49 Motor Coach - DSL Motor Coach Motor Coach EMFAC-HD

OBUS

Non-Trucks Non-Trucks

50 OBUS - GAS OBUS Other Buses EMFAC-LDV Non-Trucks Non-Trucks

51 All Other Buses - DSL All Other Buses All Other Buses EMFAC-HD Non-Trucks Non-Trucks
Appendix C – HD Idling Emission Rate Region Lookup Table

Region Type Region HD Idle ER Lookup Region

State California California

Air Basin Great Basin Valley Great Basin Valley

Air Basin Lake County Lake County

Air Basin Lake Tahoe Lake Tahoe

Air Basin Mojave Desert Mojave Desert

Air Basin Mountain Counties Mountain Counties

Air Basin North Central Coast North Central Coast

Air Basin North Coast North Coast

Air Basin Northeast Plateau Northeast Plateau

Air Basin Sacramento Valley Sacramento Valley

Air Basin Salton Sea Salton Sea

Air Basin San Diego San Diego

Air Basin San Francisco Bay Area San Francisco Bay Area

Air Basin San Joaquin Valley San Joaquin Valley

Air Basin South Central Coast South Central Coast

Air Basin South Coast South Coast

Air District Amador County APCD Mountain Counties

Air District Antelope Valley APCD Mojave Desert

Air District Bay Area AQMD San Francisco Bay Area

Air District Butte County AQMD Sacramento Valley

Air District Calaveras County APCD Mountain Counties

Air District Colusa County APCD Sacramento Valley

Air District El Dorado County APCD Mountain Counties

Air District Feather River AQMD Sacramento Valley

Air District Glenn County APCD Sacramento Valley

Air District Great Basin Unified APCD Great Basin Valley

Air District Imperial County APCD Salton Sea

Air District Kern County APCD Mojave Desert

Air District Lake County APCD Lake County

Air District Lassen County APCD Northeast Plateau

Air District Mariposa County APCD Mountain Counties

Air District Mendocino County APCD North Coast

Air District Modoc County APCD Northeast Plateau

Air District Mojave Desert AQMD Mojave Desert

Air District Monterey Bay Unified APCD North Central Coast

Air District North Coast Unified AQMD North Coast

Air District Northern Sierra AQMD Mountain Counties

Air District Northern Sonoma County APCD North Coast

Air District Placer County APCD Sacramento Valley

Air District Sacramento Metropolitan AQMD Sacramento Valley

Air District San Diego County APCD San Diego

Air District San Joaquin Valley Unified APCD San Joaquin Valley

Air District San Luis Obispo County APCD South Central Coast

Air District Santa Barbara County APCD South Central Coast

Air District Shasta County AQMD Sacramento Valley

Air District Siskiyou County APCD Northeast Plateau

Air District South Coast AQMD South Coast

Air District Tehama County APCD Sacramento Valley

Air District Tuolumne County APCD Mountain Counties

Air District Ventura County APCD South Central Coast

Air District Yolo/Solano AQMD Sacramento Valley

County Alameda San Francisco Bay Area

County Alpine Great Basin Valley

County Amador Mountain Counties

County Butte Sacramento Valley

County Calaveras Mountain Counties

County Colusa Sacramento Valley

County Contra Costa San Francisco Bay Area

County Del Norte North Coast

County El Dorado Mountain Counties

County Fresno San Joaquin Valley

County Glenn Sacramento Valley

County Humboldt North Coast

County Imperial Salton Sea

County Inyo Great Basin Valley

County Kern San Joaquin Valley

County Kings San Joaquin Valley

County Lake Lake County

County Lassen Northeast Plateau
Region Type Region HD Idle ER Lookup Region

County Los Angeles South Coast

County Madera San Joaquin Valley

County Marin San Francisco Bay Area

County Mariposa Mountain Counties

County Mendocino North Coast

County Merced San Joaquin Valley

County Modoc Northeast Plateau

County Mono Great Basin Valley

County Monterey North Central Coast

County Napa San Francisco Bay Area

County Nevada Mountain Counties

County Orange South Coast

County Placer Sacramento Valley

County Plumas Mountain Counties

County Riverside South Coast

County Sacramento Sacramento Valley

County San Benito North Central Coast

County San Bernardino South Coast

County San Diego San Diego

County San Francisco San Francisco Bay Area

County San Joaquin San Joaquin Valley

County San Luis Obispo South Central Coast

County San Mateo San Francisco Bay Area

County Santa Barbara South Central Coast

County Santa Clara San Francisco Bay Area

County Santa Cruz North Central Coast

County Shasta Sacramento Valley

County Sierra Mountain Counties

County Siskiyou Northeast Plateau

County Solano San Francisco Bay Area

County Sonoma San Francisco Bay Area

County Stanislaus San Joaquin Valley

County Sutter Sacramento Valley

County Tehama Sacramento Valley

County Trinity North Coast

County Tulare San Joaquin Valley

County Tuolumne Mountain Counties

County Ventura South Central Coast

County Yolo Sacramento Valley

County Yuba Sacramento Valley

MPO AMBAG North Central Coast

MPO BCAG Sacramento Valley

MPO COFCG San Joaquin Valley

MPO KCAG San Joaquin Valley

MPO KCOG San Joaquin Valley

MPO MCAG San Joaquin Valley

MPO MCTC San Joaquin Valley

MPO MTC San Francisco Bay Area

MPO SACOG Sacramento Valley

MPO SANDAG San Diego

MPO SBCAG South Central Coast

MPO SCAG South Coast

MPO SCRTPA Sacramento Valley

MPO SJCOG San Joaquin Valley

MPO SLOCOG South Central Coast

MPO StanCOG San Joaquin Valley

MPO TCAG San Joaquin Valley

MPO TMPO Lake Tahoe

GAI Alameda (SF) San Francisco Bay Area

GAI Alpine (GBV) Great Basin Valley

GAI Amador (MC) Mountain Counties

GAI Butte (SV) Sacramento Valley

GAI Calaveras (MC) Mountain Counties

GAI Colusa (SV) Sacramento Valley

GAI Contra Costa (SF) San Francisco Bay Area

GAI Del Norte (NC) North Coast

GAI El Dorado (LT) Lake Tahoe

GAI El Dorado (MC) Mountain Counties

GAI Fresno (SJV) San Joaquin Valley

GAI Glenn (SV) Sacramento Valley

GAI Humboldt (NC) North Coast
Region Type Region HD Idle ER Lookup Region

GAI Imperial (SS) Salton Sea

GAI Inyo (GBV) Great Basin Valley

GAI Kern (MD) Mojave Desert

GAI Kern (SJV) San Joaquin Valley

GAI Kings (SJV) San Joaquin Valley

GAI Lake (LC) Lake County

GAI Lassen (NEP) Northeast Plateau

GAI Los Angeles (MD) Mojave Desert

GAI Los Angeles (SC) South Coast

GAI Madera (SJV) San Joaquin Valley

GAI Marin (SF) San Francisco Bay Area

GAI Mariposa (MC) Mountain Counties

GAI Mendocino (NC) North Coast

GAI Merced (SJV) San Joaquin Valley

GAI Modoc (NEP) Northeast Plateau

GAI Mono (GBV) Great Basin Valley

GAI Monterey (NCC) North Central Coast

GAI Napa (SF) San Francisco Bay Area

GAI Nevada (MC) Mountain Counties

GAI Orange (SC) South Coast

GAI Placer (LT) Lake Tahoe

GAI Placer (MC) Mountain Counties

GAI Placer (SV) Sacramento Valley

GAI Plumas (MC) Mountain Counties

GAI Riverside (MD/MDAQMD) Mojave Desert

GAI Riverside (MD/SCAQMD) Mojave Desert

GAI Riverside (SC) South Coast

GAI Riverside (SS) Salton Sea

GAI Sacramento (SV) Sacramento Valley

GAI San Benito (NCC) North Central Coast

GAI San Bernardino (MD) Mojave Desert

GAI San Bernardino (SC) South Coast

GAI San Diego (SD) San Diego

GAI San Francisco (SF) San Francisco Bay Area

GAI San Joaquin (SJV) San Joaquin Valley

GAI San Luis Obispo (SCC) South Central Coast

GAI San Mateo (SF) San Francisco Bay Area

GAI Santa Barbara (SCC) South Central Coast

GAI Santa Clara (SF) San Francisco Bay Area

GAI Santa Cruz (NCC) North Central Coast

GAI Shasta (SV) Sacramento Valley

GAI Sierra (MC) Mountain Counties

GAI Siskiyou (NEP) Northeast Plateau

GAI Solano (SF) San Francisco Bay Area

GAI Solano (SV) Sacramento Valley

GAI Sonoma (NC) North Coast

GAI Sonoma (SF) San Francisco Bay Area

GAI Stanislaus (SJV) San Joaquin Valley

GAI Sutter (SV) Sacramento Valley

GAI Tehama (SV) Sacramento Valley

GAI Trinity (NC) North Coast

GAI Tulare (SJV) San Joaquin Valley

GAI Tuolumne (MC) Mountain Counties

GAI Ventura (SCC) South Central Coast

GAI Yolo (SV) Sacramento Valley

GAI Yuba (SV) Sacramento Valley