"Hot Spots" List of Substances
Contact
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:
- Proposition 65 (12/2/05) (section 25249.8), the Governor's List of Chemicals Known to the State of California to Cause Cancer or Reproductive Toxicity;
- National Toxicology Program (NTP) issued by the U.S. Secretary of Health and Human Services (Section 262 of Public Law 95-622 of 1978);
- Hazard Evaluation System and Information Service (HESIS) (Section 147.2 of the Labor Code) California Dept. of Health Services;
- U.S. EPA Office of Air Quality Planning and Standards (OAQPS) (HAP list, TRI List);
- Substances listed under Section 6382 of the Labor Code (IARC, Federal Clean Water Act, Federal Clean Air Act, OSHA, CA Dpt. Food/Ag.);
- CARB's Toxic Air Contaminant (TAC) List;
- In addition to the above lists, CARB may consider "any additional substances including those that present a chronic or acute threat to public health".
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 A | The 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" Substances | Appendix 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