This page last reviewed July 29, 2015
PROPOSED REGULATION ORDER
Amend Title 17, California Code of Regulations, Section 93000 to read as follows:
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 (BrCH2CH2Br; 1,2-Dibromoethane) | None Identified |
| Ethylene Dichloride (ClCH2CH2Cl; 1,2-Dichloroethane) | None Identified |
| Hexavalent Chromium [Cr(VI)] | None Identified |
| Asbestos [Asbestiform Varieties of Serpentine (Chrysotile) Riebeckite (Crocidolite) Cummingtonite-Grunerite (Amosite), Tremolite, Actinolite, and Anthophyllite] | None Identified |
| Dibenzo-p-dioxins and Dibenzofurans Chlorinated in the 2,3,7 and 8 Positions and Containing 4,5,6, or 7 Chlorine Atoms | None Identified |
| Cadmium (Metallic Cadmium and Cadmium Compounds) | None Identified |
| Carbon Tetrachloride (CCl4; Tetrachloromethane) | None Identified |
| Ethylene Oxide (1,2-Epoxyethane) | None Identified |
| Methylene Chloride (CH2Cl2; Dichloromethane) | None Identified |
| Trichloroethylene | None Identified |
| Chloroform (CHCl3) | None Identified |
| Vinyl Chloride (C2H3Cl; Chloroethylene) | None Identified |
| Inorganic Arsenic | None Identified |
| Nickel | None Identified |
| Perchloroethylene (C2Cl4; Tetrachloroethylene) | None Identified |
| Formaldehyde (HCHO) | None Identified |
| 1,3-Butadiene (C4H6) | None Identified |
| Inorganic Lead | None Identified |
| Diesel Exhaust | None Identified |
| NOTE: | Authority Cited: Sections
39600, 39601, and 39662, Health and Safety Code. Reference: Sections 39650, 39660, 39661, and 39662, Health and Safety Code. |
Air Toxics Program
Toxic Emisisons from Diesel-Fueled
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