Air Quality Planning and Science Division

California Greenhouse Gas Inventory - Forests and Other Lands

Background

The ARB's greenhouse gas (GHG) inventory for forests and other lands tracks the removal of carbon dixoide from the atmosphere and emissions of GHGs to the atmosphere.  The inventory includes carbon dioxide uptake by vegetation and GHG emissions from wild and prescribed fires, the decomposition and combustion of residues from harvest, conversion to other land types, and discarded wood products.  The key GHGs of concern are carbon dioxide, methane and nitrous oxide.  The exchange of carbon dioxide between the atmosphere and land occurs through uptake by plant photosynthesis and release via respiration, and the decomposition and combustion of biomass.  Methane is emitted during incomplete combustion of biomass and under anaerobic conditions in soils.  Nitrous oxide is emitted from combustion of biomass.

Current forest sector emission and sequestration estimates in the ARB's GHG inventory are based on a 2004 California Energy Commission study which quantified carbon stock in forests and rangelands. The study focused on a time period from 1994 to 2000 and was geographically limited to the northern part of the State. Results from the study were extrapolated to include the entire state and to other years. The study was limited in geographic and temporal scope and afforded few options for updating.  Updated methods for regular periodic quantification of greenhouse gas fluxes on forest, range, and other natural lands are in development.

Research and Planned Improvements

In 2011, ARB contracted with researchers from University of California (UC) Berkeley to develop a new data-driven methodology for assessing carbon stock changes for all land in California except agricultural and urban areas.  The new methods use California specific land based data sets and satellite remote sensing data.  The covered ecosystems include forests, woodlands, shrub lands, grasslands, and wetlands. Data sources for the new method include Forest Inventory and Analysis (FIA) ground-based data (vegetation type, tree species and dimensions, percent canopy cover, etc.) from the USDA-Forest Service, remote sensing products from NASA's MODIS sensor, geospatial vegetation data (vegetation community type, canopy height, percent canopy cover) from the federal Landscape Fire and Resource Management Planning Tools Project (Landfire), geospatial fire and harvest occurrence data from CalFIRE, and ancillary data on shrub lands and grasslands.

The method enables analysts to retrospectively assess ecosystem carbon stock changes resulting from fire, human activities, and other processes. It will enable monitoring of changes on the land over time and periodic quantification of the GHG flux associated with changes in ecosystem carbon stocks.  The research has generated a wealth of new data to support a planned update to the GHG inventory.

Additional work is needed to evaluate the data provided by the UC Berkeley research, to incorporate additional new data, and to identify further research needed to expand use of these tools.  The sources and methods for quantifying ecosystem carbon and GHG flux in this sector are complex.  Continued refinements will advance carbon quantification, attribution of GHG flux by disturbance process, and reduce uncertainty. 

The UC Berkeley research report describing the development of the new methodology is available below.

Links

For general questions regarding the GHG inventory for forests and other lands, please contact: Anny Huang, Manager, Emission Inventory Analysis Section, Phone: (916) 323-8475

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CEIDARS-Lite

CEIDARS-Lite
[No Longer Used at ARB]

Overview --  Who Can Use CEIDARS-Lite? --  System Requirements --
  Software Download --  Instructions --  Optional -- 

 

 

   Overview

CEIDARS-Lite may no longer be used to submit AB 2588 inventory data. HARP has replaced CEIDARS-Lite as the preferred method of data transmission.

The CEIDARS-Lite is Windows 95 or Windows NT based software that can be used to electronically submit criteria and toxic emission inventory data.  This software uses formats consistent with CEIDARS 2.5, the latest version of the California Emission Inventory Development and Reporting System, which allows the reporting of both criteria and toxic emissions.  The data entered in CEIDARS-Lite can be exported into a file which can be submitted to districts for uploading to CEIDARS 2.5.  CEIDARS-Lite is currently being used in the California Air Toxics Hot Spots regulation (AB2588). 

CEIDARS-Lite is a subset of a much larger software program called HARP (Hot Spots Analysis and Reporting Program) that also will include prioritization, dispersion analysis, and geographical information (GIS).  HARP is being completed by Dillingham Software Engineering of San Diego, CA under contract to the ARB Stationary Source Division.

 

   Who Can Use CEIDARS-Lite?

Facilities who submit either criteria air pollutant data OR toxic air pollutant data under the AB2588 "Hot Spots" program can use CEIDARS-Lite to submit their data.  Because facility data is submitted first to their local air pollution control districts, and not directly to the ARB, facilities who wish to submit their data using CEIDARS-Lite must first contact their district to obtain permission to do so.  Data should be submitted by facilities to districts, who will in turn evaluate the data and forward them to the ARB. Districts can also use this software to input area source emissions data for criteria pollutants. 

 

   System Requirements

Windows 95 or Windows NT.

At least 16 MB of RAM and 20 MB of free diskspace in your computer.

   Software Download for Installation - Required

Download (1) followed by (3) OR if you have trouble downloading (1), download (2) followed by (3).

[(1) is an executable CEIDARS-Lite setup file; (2) is all eight individual setup files.]

1.  CEIDARS-Lite (19,225 Kb) - executable CEIDARS-Lite setup file

2.  Individual Setup Files (if you are having trouble downloading the above)

3.  UPDATE - latest updated table(s).

After installing CEIDARS-Lite, use the Utilities menu in the CEIDARS-Lite program and select "Update Fixed Tables" to update the software.


   Instructions - Must read and follow to operate HARP correctly

If you have downloaded CEI_LITE.EXE, locate CEI_LITE.EXE with Windows Explorer and double click on it to start installing CEIDARS-Lite.  If you have downloaded the setup files individually, you must run SETUP1110b.EXE to install and operate the CEIDARS-Lite.  Using Windows Explorer, locate the SETUP1110b.EXE file in the download directory and double click on it to install CEIDARS-Lite.

At some point during the installation, the setup program will ask where you wish the "Data Access Libraries" to be installed.  In most cases, you should accept the recommendation of the installation program; however, on machines attached to a network, you may not have the privilege to write on the suggested directory.  In this case, type in the following directory name and click "OK": "C:\Program Files\Microsoft Shared\DAO". 

Important

Once the installation is completed, CEIDARS-Lite is ready for operation.  The setup program will create an icon on your desktop.  This icon is shaped like a harp and should be named CEIDARS-Lite.  To run the program, double click on this icon and follow the manual.

Alternately, you can launch this program from within the Windows Explorer by double clicking on the HARP.EXE file.

 

   Optional

Users Manual (714 Kb) - Adobe Acrobat format documentation

To view or print the User Manual, you need the Adobe Acrobat Reader for windows installed on your machine.  It can be downloaded free of charge from Adobe.  Note that the User Manual is over 100 pages in length.

 

Please send questions or comments to:
ARB's Emission Inventory Branch

ARB Classic URL
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"Hot Spots" List of Substances

Health and Safety Code section 44321 requires CARB to "compile and maintain a list of substances" that must be reported under the AB 2588 Air Toxics "Hot Spots" program. CARB must evaluate substances that are listed under:

Substances contained in any of the above lists that have not been added to the regulation will be reviewed as necessary and where data is available. Substances may be added to Appendix A if a potential impact on public health exists. A substance is removed from the list if no evidence exists that it has been detected in air, and is not manufactured or used in California, or, if manufactured or used in California, because of the physical or chemical characteristics of the substance or the manner in which it is manufactured or used, there is no possibility that it will become airborne.

On November 19, 2020, the California Air Resources Board (CARB) adopted amendments to the proposed Air Toxics “Hot Spots” Emission Inventory Criteria and Guidelines (EICG) Regulation, and the Regulation for the Reporting of Criteria Air Pollutants and Toxic Air Contaminants (CTR). The amendments included updates to Appendix A – list of substances and were effective March 21, 2022.

2022 EICG Updates to Appendix AThe EICG Appendix A chemical list now includes 1,925 chemicals. Appendix A-I includes 1,457 chemicals (including 3 broad functional groups), A-II includes 184 and A-III includes 284. During the 2020 EICG amendment process, 994 chemicals were added to A-I, 13 to A-II and 162 to A-III. (In a few cases, a chemical was moved from A-II to A-I). It is important to note that some chemicals were listed in an individual alphabetical location with the phrase “(see…)”, this indicates that the main listing is under a broader group of chemicals as well as the alphabetical location. Additionally, in a few cases, staff found more than one CAS number for essentially the same chemical, those use the notation “(alt. CAS, see CAS…)”. This is important to note because duplicates must be removed to get a unique count of the chemicals as calculated above. Further, there are 194 chemicals in ChemSet-1 (including 2 functional groups) and 765 ChemSet-2 chemicals.
2022 EICG Appendix A list of "Hot Spots" SubstancesAppendix A.pdf (ca.gov) (pdf) and AB2588_Appendix_A_v20220331.xlsx(ca.gov) in Excel

Prior Regulation (approved by OAL on August 27, 2007)

At the November 16, 2006, Board Hearing, the California Air Resources Board approved updates to Appendix A. The following table provides an overview to the 2007 updates and a link to the previous version of Appendix A. This list is provided for historical archive purposes. It has been superseded by the 2022 EICG regulation, effective March 21, 2022.

2007 EICG Updates to Appendix A

Bromine pentafluoride, t-Butyl acetate,2-Chlorophenol, Hydrogen bromide, Hydrogen selenide, 5-Nitroacenaphthene, 4-Nitropyrene, Oleum, Polybrominated diphenyl ethers (PBDEs), Perfluorooctanoic acid (PFOS) and derivatives, Sulfur trioxide, Tetrachlorophenols, Vanadium pentoxide, 3,3',4,4'-Tetrachlorobiphenyl (PCB 77), 3,4,4',5-Tetrachlorobiphenyl (PCB 81), 2,3,3',4,4'-Pentachlorobiphenyl (PCB 105), 2,3,4,4',5-Pentachlorobiphenyl (PCB 114), 2,3',4,4',5-Pentachlorobiphenyl (PCB 118), 2,3',4,4',5'-Pentachlorobiphenyl (PCB 123), 2,3,3',4,4',5-Hexachlorobiphenyl (PCB 156), 2,3,3',4,4',5'-Hexachlorobiphenyl (PCB 157), 2,3',4,4',5,5'-Hexachlorobiphenyl (PCB 167), 2,3',4,4',5,5'-Hexachlorobiphenyl (PCB 169), 2,3,3',4,4',5,5'-Hexachlorobiphenyl (PCB 189), Dichlorodifluoromethane (Freon 12). See Appendix A for more details.

2007 EICG Appendix A list of "Hot Spots" Substances

Appendix A in Excel

 

Emission Inventory Guidelines

 

"Hot Spots" Program

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Emission Inventory and Risk Glossary

Cancer Risk: The theoretical probability of contracting cancer when continually exposed for a lifetime (70 years) to a given concentration of a substance. The probability is usually calculated as an upper confidence limit. The maximum estimated risk may be presented as the number of chances in a million of contracting cancer.
   
CAS: Chemical Abstract Services (CAS) Registry Number is assigned to each pollutant. Do not use dashes when using a CAS # to query the CEIDARS database.
   
CEIDARS: The California Emission Inventory Database and Reporting System (CEIDARS) contains all of the emissions data for point sources at ARB.
   
CERR: CERR, the Consolidated Emission Consolidated Emission Reporting Rule, is a US/EPA requirement for certain classes of facilities.
   
CHAPIS: CHAPIS, the Community Health Air Pollution Information System, provides interactive maps of air pollution emission sources over the web.
   
Database Year: Criteria Pollutant data are available for a variety of database years. Toxics inventory data are available from 1996 to 2003 database years; however, toxic emissions may be derived from earlier emission inventory years. The toxics data are submitted to the ARB by the local air districts as a requirement of the Air Toxics "Hot Spots" Program. This Program requires emission inventory updates every four years, although more frequent updates may occur.
   
Facility ID: Facility ID is a number that identifies a particular facility. This number is assigned to the facility by the local Air District responsible for this facility.
   
Facility Name: When you search for specific facilities, remember that names will often be abbreviated; i.e. "Northern California Electric" facilities may appear both spelled out and abbreviated as both "N.C.E." and "NCE", depending on how the information was submitted by the facility owner.
   
Facility Prioritization Score: Districts prioritize facilities in the "Hot Spots" program and assign a cancer, chronic, and acute prioritization score based on those emissions. In addition to the quantity of emissions, the district's evaluation considers other factors such as the toxicity of each substance emitted from the facility. If the prioritization score is greater than the District threshold, the facility must conduct a health risk assessment. For more information see the CAPCOA Facility Prioritization Guidelines, 1990.
   
Facility Standard Industrial Classification (SIC) Code: This is a list of codes that represent various industrial classifications. This list is maintained by the US Office of Management and Budget. For example, SIC Code 2512 is used for facilities that make "Upholstered Household Furniture". One site that allows searches for particular SIC codes can be found at the US Dept. of Labor OSHA SIC Search.
   
Health Risk Assessment (HRA): A comprehensive analysis of the dispersion of hazardous substances in the environment, their potential for human exposure, and a quantitative assessment of both individual and population-wide health risks associated with those levels exposed. For more information see the OEHHA Air Toxics "Hot Spots" Program Risk Assessment Guidelines (August 2003).
   
Non-Cancer Acute
Hazard Index:		 The potential non-cancer health impacts resulting from a one-hour exposure to toxic substances. The total hazard index includes the sum of hazard indices for pollutants with non-cancer health effects that have the same or similar adverse health effects (endpoints). An acute hazard index is calculated by dividing the one-hour concentration of a toxic pollutant by the acute reference exposure level for that pollutant.
   
Non-Cancer Chronic Hazard Index: The potential non-cancer health impacts resulting from exposure to toxic substances usually lasting from one year to a lifetime. The total hazard index includes the sum of hazard indices for pollutants with non-cancer health effects that have the same or similar adverse health effects (endpoints). A chronic hazard index is calculated by dividing the annual average concentration of a toxic pollutant by the chronic reference exposure level for that pollutant.
   
Notification Levels: The district established levels where the results of the health risk assessment required under the Hot Spots Program are considered significant enough to notify the affected residents and businesses near a facility of the potential health impacts from that facility's emissions.
   
Prioritization Thresholds: These levels, established by each district, define a facility's requirements under the Hot Spots Program based on the prioritization score calculation. Commonly, there are two thresholds, an upper and lower that may be different for cancer and non-canceer prioritization evauations. Facilities with a score above the upper threshold are high priority and must perform a health risk assessment. Facilities below the lower threshold are low priority. Facilities that fall between the two thresholds are called intermediate priority and, at the district's discretion, may be required to perform a risk assessment.
   
Program Status: The current facility status in the "Hot Spots" Program (active, exempt, etc). The district may need to be contacted for specific details concerning applicability to the program, exemption, and the extent to which a facility has fulfilled emission inventory reporting and HRA requirements. Code: A - Priority Score > 10; B - 10<Risk<50; C - 50<Risk<100; D - Risk > 100; E - Unprioritized; F - 1<Risk<10; G - exempt or out of business.
   
Risk Reduction Audit and Plan (RRAP) Levels: The district established levels where the results of the health risk assessment required under the "Hot Spots" Program are considered significant enough to require the facility to prepare and implement measures to reduce its emissions and potential health risk.
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District "Hot Spots" Annual Reports

Health and Safety Code section 44363 requires each of the 35 local air districts to publish an annual report. The statute reads as follows:

(a) Commencing July 1, 1991, each district shall prepare and publish an annual report which does all of the following:

(1) Describes the priorities and categories designated pursuant to Section 44360 and summarizes the results and progress of the health risk assessment program undertaken pursuant to this part.

(2) Ranks and identifies facilities according to the degree of cancer risk posed both to individuals and to the exposed population.

(3) Identifies facilities which expose individuals or populations to any noncancer health risks.

(4) Describes the status of the development of control measures to reduce emissions of toxic air contaminants, if any.

(b) The district shall disseminate the annual report to county boards of supervisors, city councils and local health officers, and the district board shall hold one or more public hearings to present the report and discuss its content and significance. Added Stats 1987 ch 1252 1, operative July 1, 1988.

Air District Annual Reports

Bay Area AQMD

Butte County AQMD

Eastern Kern APCD

Feather River AQMD

Mariposa County APCD

North Coast Unified AQMD

Northern Sierra AQMD

Sacramento Metro AQMD

San Diego APCD

San Joaquin Valley APCD

San Luis Obispo County APCD

Santa Barbara County APCD

South Coast AQMD

Ventura County APCD

Yolo-Solano AQMD

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"Hot Spots" Public Notification

Assembly Bill (AB) 2588 (Connelly), the Air Toxics "Hot Spots" Information and Assessment Act, requires facilities found to have a significant risk from their emissions to notify all exposed persons. Once risk assessments (see Risk Assessment) are reviewed by the Office of Environmental Health Hazard Assessment (OEHHA) and approved by the air pollution control or air quality management district (district), facility operators must notify all exposed persons of the risk assessment results if the district determines that there is a potentially significant health risk associated with emissions from the facility. Each district is responsible for establishing the notification threshold at which facilities are required to notify all exposed persons with either a letter to individual neighbors, or with a newspaper notification. Some districts also require the facility to post information about the facility risk at the local library.

The California Air Pollution Control Officers Association (CAPCOA) Toxics Committee, in cooperation with OEHHA and the Air Resources Board (ARB), developed the CAPCOA Public Notification Guidelines, October 1992. The purpose of these guidelines is to assist districts in developing their public notification procedures. However, districts may develop and use notification methods which differ from the CAPCOA guidelines.

Public Notification Guidelines

Some facilities with diesel engines may have to conduct public notification. An industrywide or standard public notice for diesel PM may be appropriate, depending on district policies.

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AB 2588 District Prioritization Scores and Risk Threshold Levels

    District

Prioritization Score Threshold

Notification Level

Risk Reduction Audit and Plan

Cancer

Noncancer Chronic

Noncancer Acute

Cancer

Non- cancer

Cancer

Non- cancer

High

Low

High

Low

High

Low

Amador

≥10

   ≤1

≥10

≤1

≥10

≤1

≥10

≥1

≥10

≥1

Antelope Valley

10

1

10

1

10

1

10

1

100

10

Bay Area

≥10

<1

≥10

<1

≥10

<1

>10

>1

>100

>10

Butte

≥100

<1

≥100

<1

≥100

<1

10

≥1

none

none

Calaveras

none

none

none

none

none

none

10

none

10

none

Colusa

>10

<1

>10

<1

>10

<1

>10

>1

>10

>1

El Dorado

≥10

<1

≥10

<1

≥10

<1

none

none

none

none

Feather River

10

1

10

<1

10

1

10

1

none

none

Great Basin Unified

10

1

10

1

10

1

none

none

none

none

Glenn

10

1

10

1

10

1

10

1

none

none

Imperial

10

1

10

1

10

1

10

1

none

none

Kern

10

<1

10

<1

10

<1

10

1

100

5

Lake

10

1

10

1

10

1

none

none

20

none

Lassen

100

10

100

10

100

10

none

none

none

none

Monterey Bay Unified

≥10

≤1

≥10

≤1

≥10

≤1

>10

>1

>10

>1

Mendocino

10

1

10

1

10

1

10

1

none

none

Modoc

none

none

none

none

none

none

none

none

none

none

Mojave

≥10

<1

≥10

<1

≥10

<1

≥10

≥1

≥100

≥10

Mariposa

none

none

none

none

none

none

none

none

none

none

North Coast Unified

50

10

50

10

50

10

10

1

none

none

Northern Sierra

≥10

≥1
<10

≥10

≥1
<10

≥10

≥1
<10

none

none

none

none

Northern Sonoma

10

1

10

1

10

1

10

1

100

10

Placer

10

1

10

1

10

1

≥10

≥1

≥10

≥1

Sacramento

≥10

<1

≥10

<1

≥10

<1

≥10

≥1

≥10

≥1

San Diego

≥100

<1

≥10

<1

≥10

<1

≥10

≥1

≥100 

≥1

San Joaquin Valley

>10

≤1

>10

≤1

>10

≤1

≥10

>1

≥100

>5

San Luis Obispo

≥10

≤1

≥10

≤1

≥10

≤1

>10

>1

>10

>1

Santa Barbara

>10

<1

>10

<1

>10

<1

≥10

>1

≥10

>1

Shasta

10

1

10

1

10

1

10

1

10

1

Siskiyou

>100

<1

>100

<1

>100

<1

10

1

100

5

South Coast

>10

≤1

>10

≤1

>10

≤1

≥10

≥1

≥25
cancer burden
≥0.5

≥3

Tehama

100

1

100

1

100

1

none

none

none

none

Tuolumne

50

10

50

10

50

10

10

>1

10

>1

Ventura

≥10

≤1

≥10

≤1

≥10

≤1

≥10

≥1

≥10

≥1

Yolo-Solano

10

1

10

1

10

1

10

1

none

none

Source: Updated upon District request, based on ARB/CAPCOA Risk Management Guidance for Stationary Sources of Air Toxics, July 23, 2015

Last updated: 10/5/2021

 

Air Toxics “Hot Spots" Program

 

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Instructions for Using Diesel Engine Screening Risk Assessment Tables

Use these steps when calculating a screening health risk assessment score for a facility with stationary diesel engines.
 

Step 1

Before beginning your analysis, determine the Load, Engine Size, Emission Factor, Distance to Nearest Receptor, and Annual Hours of Operation for each of your engines. The district will help you determine the Urban/Rural Option.

Step 2

Please choose the load that most closely matches the average load for the engine during testing (either 50 or 75% load). Then click on the table with the engine size that is closest in size to your engine.

Step 3

Find the matrix that corresponds to your emission factor (either 0.01, 0.15, 0.40, 0.55, or 1.0 g/bhp-hr). If you do not know the emission rate of your engine, use 1.0 g/bhp-hr. 

Step 4

Find the row that corresponds to the correct number of hours of operation (on the left of the table), and the column with the correct receptor distance (between 20 and 1600 meters) to calculate the risk from that engine.

Step 5

Repeat these steps for the other engines and sum the results to get the total facility risk.

Step 6

Work with local air district to determine next steps.

 


Example Calculation:

Step 1:
Engine load = 50% (estimated)
Engine size = 180 hp (maximum rated horsepower)
Emission factor = 0.40 g/bhp-hr (certified emission rate at maximum load - assume 1.0g/bhp-hr if unknown)
Annual hours of operation = 29 h (includes all operating hours, including maintenance and testing, except actual emergency hours)
Distance to nearest receptor = 53 m (measured from the engine to the nearest residential or commercial receptor)

Step 2: Since the engine primarily performs at minimal load during testing, we will use the 50% load tables. The 180 hp engine is closest in size to the 175 hp engine, so we will use the 175 hp table for this example.

Step 3: Click on the 175 hp table and find the matrix that corresponds to 0.40 g/bhp-hr.

Step 4: Identify the row that corresponds to 30 hours (closest to 29 hours) and read across until you find the risk value that is directly under 50 meters (closest to 53 meters). The maximum estimated risk is 8 per million.

Step 5: Repeat as necessary and sum the results to get the total facility risk.

Step 6: Submit results of screening risk calculation to the local air district upon request.

A copy of the MS Excel spreadsheets is available: (50% load) and (75% load).

Because some receptors may be located closer to the engine than the point of maximum impact (the PMI or area of highest risk), we have created tables that retain the higher risk numbers for distances closer than the PMI in order to ensure that these screening tables are still health conservative (50% modified) and (75% modified).

 

Back to Screening Risk Spreadsheets
"Hot Spots" Program

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DRAFT Clearinghouse of Diesel Engine Emission Factors

The DRAFT Clearinghouse of diesel engine emissions data has been provided below to local air district staff for district staff to review. The MS Access database is linked below, and each file is also provided in MS Excel format.
The data has not been reviewed or evaluated by ARB. This data is for review only. Most of the emissions data is incomplete, the fuel may be unspecified, and the study and data may not have been peer-reviewed. Some of the reports are no longer available. ARB staff does not have copies of any of these reports.

Clearinghouse of diesel engine emissions data (link to MS Access database)

Excel Documents

Appendix A - Appendix B - Documents

Carbonyls - Dioxins and Furans - Emissions Data - Engine Data - Fuel Data

Metals/Inorganics - Speciated Hydrocarbons - Heavy Hydrocarbons

Nitrosamines - PAH/NPAH - Hopanes/Steranes

Quick Data Summary

There are 26 acrolein emission factors from the 180 data records for Carbonyls, only 1 Dioxins and Furans study, 674 records for Emissions Data, 54 records for Metals/Inorganic, 139 records for Speciated Hydrocarbons, only 8 records for Heavy Hydrocarbons, 22 records with limited data for Nitrosamines, 225 records for PAHs and Nitro-PAHs, and 35 detailed records for Hopanes and Steranes. A comparison of acrolein vs. PM is here .

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CAS Numbers

(Chemical Abstracts Service Registry Numbers)

 
The following substance names are sorted by Chemical Abstracts Service registry numbers and provide a cross reference to the associated Department of Transportation (DOT) number/ARB Emittent ID and substance name.
 

CAS # / ARB Emitent ID

 

DOT #,+

 Substance Name

 

    

50-00-0

  

*

Formaldehyde

50-29-3

 

2761

 DDT (Dichlorodiphenyltrichloroethane) (Please see DDE.)

50-32-8

  

*

Benzo[a]pyrene (Please see POM.)

51-28-5

   2,4-Dinitrophenol

51-79-6

  

*

Ethyl Carbamate (Urethane)

53-70-3

  

*

Dibenz[a,h]anthracene (Please see POM.)

53-96-3

   2-Acetylaminofluorene

55-18-5

   N-Nitrosodiethylamine (Please see Dialkylnitrosamines.)

56-23-5

 

1846

*

Carbon Tetrachloride

56-38-2

 

2783/2784

 Parathion

56-49-5

  

*

3-Methylcholanthrene

56-55-3

  

*

Benzo[a]anthracene (Please see POM.)

57-12-5

  

*

Cyanide Compounds

57-14-7

 

1163

 1,1-Dimethyl Hydrazine

57-57-8

   Beta-Propiolactone

57-74-9

 

2762

 Chlordane

57-97-6

  

*

7,12-Dimethylbenz[a]anthracene

58-89-9

 

2761

*

Lindane (All Isomers)

58-90-2

   2,3,4,6-Tetrachlorophenol (Please see Chlorophenols.)

59-89-2

   N-Nitrosomorpholine

60-11-7

   Dimethyl Aminoazobenzene

60-34-4

 

1244

 Methyl Hydrazine

60-35-5

  

*

Acetamide

62-53-3

 

1547

*

Aniline

62-56-6

 

2877

++

Thiourea

62-73-7

 

2783

 Dichlorvos (DDVP)

62-75-9

  

*

N-Nitrosodimethylamine

63-25-2

 

2757

 Carbaryl

64-67-5

 

1594

++

Diethyl Sulfate

67-56-1

 

1230

*

Methanol

67-63-0

 

1219

 Isopropyl Alcohol

67-66-3

 

1888

*

Chloroform

67-72-1

 

9037

*

Hexachloroethane

68-12-2

 

2265

*

Dimethyl Formamide

71-36-3

 

1120

 N-Butyl Alcohol

71-43-2

 

1114

*

Benzene

71-55-6

 

2831

*

Methyl Chloroform (1,1,1-Trichloroethane)

72-43-5

 

2761

 Methoxychlor

72-55-9

   DDE (P,P-Dichlorodiphenyldichloroethylene)

74-83-9

 

1062

*

Methyl Bromide (Bromomethane)

74-87-3

 

1063

 Methyl Chloride (Chloromethane)

74-88-4

 

2644

 Methyl Iodide (Iodomethane)

74-90-8

 

1613/1051

 Hydrocyanic Acid (Please see Cyanide Compounds.)

75-00-3

 

1037

*

Ethyl Chloride (Chloroethane)

75-01-4

 

1086

*

Vinyl Chloride

75-05-8

 

1648

 Acetonitrile

75-07-0

 

1089

*

Acetaldehyde

75-09-2

 

1593

*

Methylene Chloride (Dichloromethane)

75-15-0

 

1131

*

Carbon Disulfide

75-21-8

 

1040

*

Ethylene Oxide

75-25-2

 

2515

 Bromoform

75-34-3

 

2362

*

Ethylidene Dichloride (1,1-Dichloroethane)

75-35-4

 

1303

*

Vinylidene Dhloride (1,1-Dichloroethylene)

75-43-4

   Dichlorofluoromethane {Freon 21}

75-44-5

 

1076

*

Phosgene

75-55-8

 

1921

 1,2-Propylenimine (2-Methyl Aziridine)

75-56-9

 

1280

*

Propylene Oxide

75-65-0

 

1120

 Tert-Butyl Alcohol

75-71-8

   Dichlorodifluoromethane {Freon 12}

76-13-1

   Chlorinated Fluorocarbons

76-44-8

 

2761

 Heptachlor

77-47-4

 

2646

 Hexachlorocyclopentadiene

77-78-1

 

1595

 Dimethyl Sulfate

78-59-1

 

1993

*

Isophorone

78-87-5

 

1279

 Propylene Dichloride (1,2-Dichloropropane)

78-92-2

 

1120

 Sec-Butyl Alcohol

78-93-3

 

1193/1232

*

Methyl Ethyl Ketone (2-Butanone)

79-00-5

 

2831

*

1,1,2-Trichloroethane

79-01-6

 

1710

*

Trichloroethylene

79-06-1

 

2074

*

Acrylamide

79-10-7

 

2218

*

Acrylic Acid

79-11-8

 

1750/1751

++

Chloroacetic Acid

79-21-0

 

2131

++

Peracetic Acid

79-34-5

 

1702

*

1,1,2,2-Tetrachloroethane

79-44-7

 

2262

 Dimethyl Carbamoyl Chloride

79-46-9

 

2608

*

2-Nitropropane

80-05-7

   4,4'-Isopropylidenediphenol

80-15-9

 

2116

++

Cumene Hydroperoxide

80-62-6

 

1247

*

Methyl Methacrylate

82-68-8

   Pentachloronitrobenzene (Quintozene)

83-32-9

   Acenaphthene (Please see POM.)

84-74-2

   Dibutylphthalate

85-01-8

   Phenanthrene (Please see POM.)

85-44-9

 

2214

*

Phthalic Anhydride

85-68-7

   Butyl Benzyl Phthalate

86-30-6

   N-Nitrosodiphenylamine

86-73-7

   Fluorene (Please see POM.)

87-68-3

 

2279

 Hexachlorobutadiene

87-86-5

 

2020

*

Pentachlorophenol

88-06-2

  

*

2,4,6-Trichlorophenol

90-04-0

 

2431

 O-Anisidine

90-43-7

   2-Phenylphenol

91-20-3

 

1334/2304

*

Naphthalene

91-22-5

 

2656

++

Quinoline

91-94-1

  

*

3,3'-Dichlorobenzidene

92-52-4

   Biphenyl

92-67-1

   4-Aminobiphenyl

92-87-5

 

1885

 Benzidine

92-93-3

   4-Nitrobiphenyl

94-75-7

 

2765

 2,4-D, Salts and Esters

95-47-6

 

1307

* 

O-Xylene (Please see Xylenes - Isomers and Mixture.)

95-48-7

 

2076

 O-Cresol (Please see Cresols.)

95-53-4

 

1708

 O-Toluidine

95-57-8

 

2020/2021

++

O-Chlorophenol (Please see Chlorophenols.)

95-63-6

 

2325

 1,2,4-Trimethylbenzene

95-70-5

   2,5-Diaminotoluene
(Please see Diaminotoluene - Mixed Isomers.)

95-80-7

 

1709

 2,4-Toluene Diamine (2,4-Diaminotoluene)

95-95-4

   2,4,5-Trichlorophenol

96-09-3

  

*

Styrene Oxide

96-12-8

 

2872

 1,2-Dibromo-3-Chloropropane (DBCP)

96-45-7

  

*

Ethylene Thiourea

98-07-7

 

2226

++

Benzotrichloride

98-82-8

 

1918

 Cumene

98-86-2

   Acetophenone

98-88-4

 

1736

++

Benzoyl Chloride

98-95-3

 

1662

*

Nitrobenzene

100-02-7

 

1663

++

4-Nitrophenol

100-21-0

   Terephthalic Acid

100-41-4

 

1175

*

Ethyl Benzene

100-42-5

 

2055

*

Styrene

100-44-7

 

1738

*

Benzyl Chloride

101-14-4

  

*

4,4'-Methylene Bis(2-Chloroaniline)

101-68-8

 

2489

*

Methylene Diphenyl Diisocyanate (MDI)

101-77-9

  

*

4,4-Methylenedianiline

103-23-1

   Bis(2-Ethylhexyl)Adipate

105-60-2

   Caprolactam

106-42-3

 

1307

*

P-Xylene (Please see Xylenes - Isomers and Mixture)

106-44-5

 

2076

 P-Cresol (Please see Cresols.)

106-46-7

 

1592

*

1,4-Dichlorobenzene (P-Dicholorobenzene)

106-48-9

 

2020/2021

++

P-Chlorophenol (Please see Chlorophenols.)

106-50-3

 

1673

 P-Phenylenediamine

106-51-4

 

2587

 Quinone

106-88-7

  

*

1,2-Epoxybutane

106-89-8

 

2083

*

Epichlorohydrin

106-93-4

 

1605

*

Ethylene Dibromide (1,2-Dibromoethane)

106-99-0

 

1010

*

1,3-Butadiene

107-02-8

 

1092

*

Acrolein

107-05-1

 

1100

*

Allyl Chloride

107-06-2

 

1184

*

Ethylene Dichloride (1,2-Dichloroethane)

107-13-1

 

1093

*

Acrylonitrile

107-21-1

  

*

Ethylene Glycol

107-30-2

 

1239

 Chloromethyl Methyl Ether

108-05-4

 

1301

*

Vinyl Acetate

108-10-1

 

1245

 Methyl Isobutyl Ketone (Hexone)

108-31-6

 

2215

*

Maleic Anhydride

108-38-3

 

1307

*

M-Xylene (Please see Xylenes - Isomers and Mixture.)

108-39-4

 

2076

 M-Cresol (Please see Cresols.)

108-43-0

 

2020/2021

++

M-Chlorophenol (Please see Chlorophenols.)

108-88-3

 

1294

*

Toluene

108-90-7

 

1134

*

Chlorobenzene

108-95-2

 

1671/2312/2821

*

Phenol

109-86-4

  

*

Ethylene Glycol Monomethyl Ether

110-49-6

   Ethylene Glycol Monomethyl Ether Acetate

110-54-3

 

1208

*

Hexane

110-80-5

 

1171

*

Ethylene Glycol Monoethyl Ether (Please see Glycol Ethers.)

110-82-7

 

1145

 Cyclohexane

111-15-9

  

 *

Ethylene Glycol Monoethyl Ether Acetate

111-30-8

   Glutaraldehyde

111-42-2

  

*

Diethanolamine

111-44-4

 

1916

 Dichloroethyl Ether (Bis(2-Chloroethyl) Ether)

111-76-2

  

*

Ethylene Glycol Monobutyl Ether

114-26-1

   Propoxur (Baygon)

115-07-1

 

1075/1077

++

Propene

115-32-2

 

2761

++

Dicofol

117-81-7

  

*

Bis(2-Ethylhexyl)Phthalate (DEHP)

118-74-1

 

2729

* ++

Hexachlorobenzene

119-90-4

   3,3'-Dimethoxybenzidine

119-93-7

   3,3'-Dimethyl Benzidine (O-Tolidine)

120-12-7

   Anthracene (Please see POM.)

120-80-9

   Catechol

120-82-1

 

2321

 1,2,4-Trichlorobenzene

121-14-2

   2,4-Dinitrotoluene

121-44-8

 

1296

*

Triethylamine

121-69-7

 

2253

 N,N-Dimethylaniline

122-66-7

   1,2-Diphenylhydrazine

123-31-9

 

2662

 Hydroquinone

123-38-6

 

1275

++

Propionaldehyde

123-91-1

 

1165

*

1,4-Dioxane

126-99-8

 

1991

 Chloroprene

127-18-4

 

1897

*

Tetrachloroethylene (Perchloroethylene)

129-00-0

   Pyrene (Please see POM.)

131-11-3

 

9188

 Dimethyl Phthalate

132-64-9

   Dibenzofuran

133-06-2

 

9188

 Captan

133-90-4

   Chloramben

139-13-9

   Nitrilotriacetic Acid

140-88-5

 

1917

 Ethyl Acrylate

141-32-2

 

2348

 Butyl Acrylate

151-56-4

 

1185

 Ethylene Imine (Aziridine)

156-62-7

 

1403

 Calcium Cyanamide

189-55-9

  

*

Dibenzo[a,i]pyrene

189-64-0

  

*

Dibenzo[a,h]pyrene

191-30-0

  

*

Dibenzo[a,l]pyrene

191-24-2

   Benzo[g,h,i]perylene (Please see POM.)

192-65-4

  

*

Dibenz[a,e]pyrene (Please see POM.)

193-39-5

  

*

Indeno[1,2,3-cd]pyrene (Please see POM.)

194-59-2

  

*

7H-Dibenzo[c,g]carbazole

205-82-3

  

*

Benzo[j]fluoranthene

205-99-2

  

*

Benzo[b]fluoranthene (Please see POM.)

206-44-0

   Fluoranthene (Please see POM.)

207-08-9

  

*

Benzo[k]fluoranthene (Please see POM.)

208-96-8

   Acenaphthylene (Please see POM.)

218-01-9

  

*

Chrysene (Please see POM.)

224-42-0

  

*

Dibenz[a,j]acridine

226-36-8

  

*

Dibenz[a,h]acridine

302-01-2

 

2029/2030

*

Hydrazine

334-88-3

   Diazomethane

463-58-1

 

2204

++

Carbonyl Sulfide

496-72-0

   3,4-Diaminotoluene (Please see Diaminotoluene - Mixed Isomers.)

510-15-6

   Chlorobenzilate

532-27-4

 

1697

 2-Chloroacetophenone

534-52-1

 

1598

 4,6-Dinitro-O-Cresol and Salts

540-84-1

 

1262

++

2,2,4-Trimethylpentane

540-88-5

   t-Butyl acetate

542-75-6

 

2047

 1,3-Dichloropropene (Telone)

542-88-1

 

2249

*

Bis(Chloromethyl)Ether

584-84-9

 

2078

*

2,4-Toluene Diisocyanate

593-60-2

 

1085

 Vinyl Bromide

602-87-9

  

*

5-Nitroacenaphthene

607-57-8

  

*

2-Nitrofluorene

608-73-1

   Hexachlorocyclohexanes

624-83-9

 

2480

*

Methyl Isocyanate

680-31-9

   Hexamethylphosphoramide

684-93-5

   N-Nitroso-N-Methylurea

822-06-0

 

2281

*

Hexamethylene-1,6-Diisocyanate

823-40-5

   2,6-Diaminotoluene
(Please see Diaminotoluene - Mixed Isomers)

1120-71-4

  

*

1,3-Propane Sultone

1163-19-5

   Decabromodiphenyl Oxide

1304-56-9

   Beryllium Oxide (Please see Beryllium Compounds.)

1306-23-6

   Cadmium Sulfide
(Please see Cadmium and Cadmium Compounds.)

1307-96-6

   Cobalt (II) Oxide (Please see Cobalt Compounds.)

1309-64-4

  

*

Antimony Trioxide (Please see Antimony Compounds.)

1310-73-2

 

1823/1824

 Sodium Hydroxide

1313-27-5

   Molybdenum Trioxide

1314-13-2

 

1516

 Zinc Oxide (Please see Zinc Compounds.)

1314-62-1

   Vanadium Pentoxide

1319-77-3

 

2022/2076

* ++

Cresols / Cresylic Acid (Isomers and Mixture.)

1327-53-3

   Arsenic Trioxide (Please see Arsenic and Compounds.)

1330-20-7

 

1307

* ++

Xylenes (Isomers and Mixture)

1332-21-4

 

2212/2590

*

Asbestos

1333-86-4

   Carbon Black Extracts

1336-36-3

 

2315

* ++

Polychlorinated Biphenyls (PCBs)

1582-09-8

   Trifluralin

1634-04-4

 

2398

* ++

Methyl Tert-Butyl Ether (MTBE)

1746-01-6

  

*

2,3,7,8-Tetrachlorodibenzo-P-Dioxin (TCDD)
(Please see Chlorinated Dioxins.)

2795-39-3

   Perfluorooctanoic acid (PFOA) and its salts, esters, and sulfonates

3268-87-9

  

*

1,2,3,4,6,7,8,9-Octachlorodibenzo-p-Dioxin

3697-24-3

  

*

5-Methylchrysene

4239-76-48

  

*

1,6-Dinitropyrene

4239-76-59

  

*

1,8-Dinitropyrene

5120-73-19

  

*

2,3,7,8-Tetrachlorodibenzofuran

5522-43-0

  

 *

1-Nitropyrene

3333-67-3

   Nickel carbonate

6484-52-2

 

0222/1942/2426

++

Ammonium Nitrate

7429-90-5

   Aluminum and Compounds

7439-92-1

   *Lead and Compounds

7439-96-5

   *Manganese Compounds

7439-97-6

 

2809

 *Mercury Compounds

7440-02-0

  

*

Nickel and Compounds

7440-22-4

   Silver Compounds

7440-36-0

 

2871

*

Antimony Compounds

7440-38-2

 

1558

*

Arsenic and Compounds

7440-39-3

 

1399/1400/1854

++

Barium Compounds

7440-41-7

 

1566/1567

*

Beryllium Compounds

7440-43-9

 

2570

*

Cadmium and Cadmium Compounds

7440-47-3

  

*

Chromium and Compounds

7440-48-4

  

*

Cobalt Compounds

7440-50-8

   Copper Compounds

7440-66-6

 

1383/1436

++

Zinc Compounds

7446-34-6

   Selenium Monosulfide (Please see Selenium Compounds.)

7446-71-9

   Sulfur Trioxide

7487-94-7

 

1624

++

Mercuric Chloride (Please see Mercury Compounds.)

7550-45-0

 

1838

++

Titanium Tetrachloride

7553-56-2

   Iodine (Please see Radionuclides - Including Radon.)

1175

 

(7631-86-9)

 Crystalline Silica (respirable)

7647-01-0

 

1050/1789

*

Hydrochloric Acid

7664-38-2

 

1805

 Phosphoric Acid

7664-39-3

 

1052/1790

*

Hydrogen Fluoride (Hydrofluoric Acid)

7664-41-7

 

1005/2073/2672

 Ammonia

7664-93-9

 

1830/1831/1832

 Sulfuric Acid

7697-37-2

 

1760/2031/2032

 Nitric Acid

7723-14-0

 

1381

*

Phosphorus

7726-95-6

 

1744

 Bromine Compounds (Inorganic)

7758-01-2

   Potassium Bromate
(Please see Bromine Compounds - Inorganic.)

7758-98-7

   Copper Sulfate (Please see Copper Compounds.)

7782-49-2

 

2658

*

Selenium Compounds

7782-50-5

 

1017

*

Chlorine

7783-06-4

 

1053

 Hydrogen Sulfide

7783-07-5

   Htydrogen Selenide

7783-20-2

 

2506

++

Ammonium Sulfate

7784-42-1

 

2188

*

Arsine (Please see Arsenic and Compounds.)

7789-30-2

   Bromine Pentafluoride

7803-51-2

 

2199

*

Phosphine

8001-35-2

 

2761

 Toxaphene (Chlorinated Camphene)

8001-58-9

 

1136

++Creosotes, Coal Tar (Please see Creosotes.)

8014-95-7

   Oleum

8018-01-7

   Mancozeb (Please see Manganese Compounds.)

8021-39-4

   Creosotes, Wood (Please see Creosotes.)

10035-10-6

   Hydrogen bromide

10043-01-3

 

1760/9078

++Aluminum Sulfate (Please see Aluminum and Compounds.)

10043-92-2

   Radon (Please see Radionuclides - Including Radon)

10049-04-4

   Chlorine Dioxide

10124-36-4

   Cadmium Sulfate
(Please see Cadmium and Cadmium Compounds.)

13463-39-3

 

1259

 Nickel Carbonyl (Please see Nickel and Compounds.)

13510-49-1

   Beryllium Sulfate(Please see Beryllium Compounds.)

14464-46-1

   Cristobalite (Please see Crystalline Silica.)

14808-60-7

   Quartz (Please see Crystalline Silica.)

15468-32-3

   Tridymite (Please see Crystalline Silica.)

18540-29-9

  

*

Chromium VI (Please see Chromium and Compounds.)

19408-74-3

  

*

1,2,3,7,8,9-Hexachlorodibenzo-p-Dioxin

35822-46-9

  

*

1,2,3,4,6,7,8-Heptachlorodibenzo-p-Dioxin

39001-02-0

  

*

1,2,3,4,6,7,8,9-Octachlorodibenzofuran

39227-28-6

  

*

1,2,3,4,7,8-Hexachlorodibenzo-p-Dioxin

40321-76-4

  

*

1,2,3,7,8-Pentachlorodibenzo-p-Dioxin

55673-89-7

  

*

1,2,3,4,7,8,9-Heptachlorodibenzofuran

57117-31-4

  

*

2,3,4,7,8-Pentachlorodibenzofuran

57117-41-6

  

*

1,2,3,7,8-Pentachlorodibenzofuran

57117-44-9

  

*

1,2,3,6,7,8-Hexachlorodibenzofuran

57653-85-7

  

*

1,2,3,6,7,8-Hexachlorodibenzofuran

60851-34-5

  

*

2,3,4,6,7,8-Hexachlorodibenzofuran

67562-39-4

  

*

1,2,3,4,6,7,8-Heptachlorodibenzofuran

70648-26-9

  

*

1,2,3,4,7,8-Hexachlorodibenzofuran

72918-21-9

  

*

1,2,3,7,8,9-Hexachlorodibenzofuran

20859-73-8

   Aluminum Phosphide
(Please see Aluminum and Compounds.)

22967-92-6

   Methyl Mercury (Please see Mercury Compounds.)

25167-83-3

   Tetrachlorophenols

25551-13-7

   Trimethylbenzenes

26471-62-5

   Toluene diisocyanates

31508-00-6

   2,3',4,4',5-Pentachlorobiphenyl (PCB118)

32598-13-3

   3,3',4,4'-Tetrachlorobiphenyl (PCB 77)

32598-14-4

   2,3,3',4,4'-Pentachlorobiphenyl (PCB 105)

32774-16-6

   3,3',4,4',5,5'-Hexachlorobiphenyl (PCB 169)

38380-08-4

   2,3,3',4,4',5-Hexachlorobiphenyl (PCB 156)

39635-31-9

   2,3,3',4,4',5,5'-Heptachlorobiphenyl (PCB 189)

52663-72-6

   2,3',4,4',5,5'-Hexachlorobiphenyl (PCB 167)

57465-28-8

   3,3',4,4',5-Pentachlorobiphenyl (PCB 126)

57835-92-4

  

*

4-Nitropyrene

65510-44-3

   2,3',4,4',5'-Pentachlorobiphenyl (PCB 123)

69782-90-7

   2,3,3',4,4',5'-Hexachlorobiphenyl (PCB 157)

70362-50-4

   3,4,4',5-Tetrachlorobiphenyl (PCB81)

74472-37-0

   2,3,4,4',5-Pentachlorobiphenyl (PCB 114)

N/A

  

*

Chlorinated Dibenzofurans (Please see Chlorinated Dioxins.)

N/A

  

*

Chlorinated Dioxins
   1060 Chlorophenols
   1066 Coke Oven Emissions
   1070 Creosotes
   1075 Dialkylnitrosamines
   1078 Diaminotoluene (Mixed Isomers)
   1090 Environmental Tobacco Smoke
   1135 Fine Mineral Fibers
   1110 Gasoline Vapors

N/A

   Glycol Ethers

N/A

  

*

Inorganic Arsenic (Please see Arsenic and Compounds.)
   1128

*

Inorganic Lead (Please see Lead and Compounds.)
   1165 Radionuclides (Including Radon)
  2222 Polybrominated diphenylethers (PBDEs)
  9901

*

Diesel Exhaust Particulate Matter (Diesel PM)
    Polycyclic Organic Matter (POM)

+

Department of Transportation (DOT) identification number indicates that the chemical is regulated by DOT. This information was found in the NIOSH Pocket Guide to Chemical Hazards (June 1994).

++

Department of Transportation (DOT) identification number found in Dangerous Properties of Industrial Materials, seventh edition, 1989, Sax.

*

Substances which have already been identified by the Board as toxic air contaminants and which have potency numbers developed by the Office of Environmental Health Hazard Assessment and approved by the Scientific Review Panel.

Toxic Air Contaminant (TAC) Indentification Program

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