Cal. Code Regs. Tit. 17, § 93000 - Substances Identified As Toxic Air Contaminants

Each substance identified in this section has been determined by the State Board to be a toxic air contaminant as defined in Health and Safety Code section 39655. If the State Board has found there to be a threshold exposure level below which no significant adverse health effects are anticipated from exposure to the identified substance, that level is specified as the threshold determination. If the Board has found there to be no threshold exposure level below which no significant adverse health effects are anticipated from exposure to the identified substance, a determination of "no threshold" is specified. If the Board has found that there is not sufficient available scientific evidence to support the identification of a threshold exposure level, the "Threshold" column specifies "None identified."

Substance	Threshold Determination
Benzene (C6H6)	None identified
Ethylene Dibromide	None identified
(BrCH2CH2Br; 1,2-dibromoethane)
Ethylene Dichloride	None identified
(ClCH2CH2Cl; 1,2-dichloroethane)
Hexavalent chromium (Cr (VI))	None identified
Asbestos [asbestiform varieties of serpentine	None identified
(chrysotile), riebeckite (crocidolite),
cummingtonite-grunerite (amosite), tremolite,
actinolite, and anthophyllite]
Dibenzo-p-dioxins and Dibenzofurans	None identified
chlorinated in the 2,3,7 and 8 positions and
containing 4,5,6 or 7 chlorine atoms
Cadmium (metallic cadmium and cadmium	None identified
compounds)
Carbon Tetrachloride	None identified
(CCl4; tetrachloromethane)
Ethylene Oxide (1,2-epoxyethane)	None identified
Methylene Chloride	None identified
(CH2Cl2; Dichloromethane)
Trichloroethylene	None identified
(CCl2CHCl; Trichloroethene)
Chloroform (CHCl3)	None identified
Vinyl chloride	None identified
(C2H3Cl; Chloroethylene)
Inorganic Arsenic	None identified
Nickel (metallic nickel	None identified
and inorganic nickel compounds)
Perchloroethylene	None identified
(C2Cl4; Tetrachloroethylene)
Formaldehyde	None identified
(HCHO)
1,3-Butadiene	None identified
(C4H6)
Inorganic Lead	None identified
Particulate Emissions from Diesel-Fueled Engines	None identified
Environmental Tobacco Smoke	None identified

Notes

Cal. Code Regs. Tit. 17, § 93000

Note: Authority cited: Sections 39600, 39601 and 39662, Health and Safety Code. Reference: Sections 39650, 39660,39661 and 39662, Health and Safety Code.

1. New section filed 9-23-85; effective thirtieth day thereafter (Register 85, No. 39). For history of former subchapter 7, see Registers 84, No. 10; 83, No. 2; 81, No. 48; 77, No. 12; and 74, No. 47.
2. Amendment filed 1-14-86; effective thirtieth day thereafter (Register 86, No. 3).
3. Amendment filed 2-10-86; effective thirtieth day thereafter (Register 86, No. 7).
4. Amendment filed 10-9-86; effective thirtieth day thereafter (Register 86, No. 43).
5. Amendment filed 11-25-86; effective thirtieth day thereafter (Register 86, No. 48).
6. Amendment filed 2-23-87; effective thirtieth day thereafter (Register 87, No. 9).
7. Amendment filed 10-8-87; operative 11-7-87 (Register 87, No. 43).
8. Amendment filed 3-15-88; operative 4-14-88 (Register 88, No. 13).
9. Amendment filed 7-22-88; operative 8-21-88 (Register 88, No. 31).
10. Amendment adding Methylene Chloride filed 6-7-90; operative 7-7-90 (Register 90, No. 30).
11. Amendment adding Trichloroethylene filed 2-27-91; operative 3-29-91 (Register 91, No. 13).
12. Amendment adding Vinyl chloride filed 5-10-91; operative 6-9-91 (Register 91, No. 25).
13. Editorial correction, including removal of Inorganic arsenic (Register 91, No. 25).
14. Amendment adding Chloroform filed 5-10-91; operative 6-9-91 (Register 91, No. 25).
15. Amendment adding Inorganic Arsenic filed 6-6-91; operative 7-6-91 (Register 91, No. 26).
16. Change without regulatory effect amending Trichloroethylene and adding Nickel filed 7-14-92 pursuant to section 100, title 1, California Code of Regulations (Register 92, No. 29).
17. Amendment adding Perchloroethylene filed 10-2-92; operative 11-1-92 (Register 92, No. 40).
18. Amendment adding Formaldehyde filed 3-2-93; operative 4-1-93 (Register 93, No. 10).
19. Amendment adding 1,3-Butadiene filed 4-14-93; operative 5-14-93 (Register 93, No. 16).
20. Editorial correction (Register 98, No. 16).
21. Amendment adding inorganic lead filed 4-14-98; operative 5-14-98 (Register 98, No. 16).
22. Amendment adding "Particulate Emissions from Diesel-Fueled Engines" filed 7-21-99; operative 8-20-99 (Register 99, No. 30).
23. Amendment adding "Environmental Tobacco Smoke" filed 1-9-2007; operative 2-8-2007 (Register 2007, No. 2).