Proposed Regulation Order

This page last reviewed July 29, 2015


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 Engines