Carbon monoxide
A colorless, odorless toxic gas produced by any process that involves the incomplete combustion of carbon-containing substances. It is emitted through the exhaust of gasoline powered vehicles.

Carcinogen
A substance or agent capable of causing or producing cancer in mammals, including humans. A chemical is considered to be a carcinogen if: a) it has been evaluated by the International Agency for Research on Cancer (IARC) and found to be a carcinogen or potential carcinogen; or b) it is listed as a carcinogen or potential carcinogen in the Annual Report on Carcinogens published by the National Toxicology Program (NTP) (latest edition); or c) it is regulated by OSHA as a carcinogen.

CAS
Chemical Abstracts Service is an organization under the American Chemical Society. CAS abstracts and indexes chemical literature from all over the world in ’Chemical Abstracts.’ CAS Numbers are used to identify specific chemicals or mixtures.

Ceiling limit (C)
An airborne concentration of a toxic substance in the work environment, which should never be exceeded.

CERCLA
Comprehensive Environmental Response, Compensation and Liability Act of 1980. Commonly known as ’Superfund.’ (US EPA)

CFR
Code of Federal Regulations. A collection of the regulations that have been promulgated under United States Law.

Chemical cartridge respirator
A respirator that uses various chemical substances to purify inhaled air of certain gases and vapors. This type respirator is effective for concentrations no more than ten times the TLV of the contaminant, if the contaminant has warning properties (odor or irritation) below the TLV.

CHEMTREC
Chemical Transportation Emergency Center. Public service of the Chemical Manufacturers Association that provides immediate advice for those at the scene of hazardous materials emergencies. CHEMTREC has a 24-hour toll-free telephone number (800-424-9300) to help respond to chemical transportation emergencies.

Chronic effect
An adverse effect on a human or animal body, with symptoms which develop slowly over a long period of time or which recur frequently. Also see ’acute.’

Combustible liquid
Combustible liquids are those having a flash point at or above 37.8oC (100oF).

Concentration
The amount of a given substance in a stated unit of measure. Common methods of stating concentration are percent by weight or by volume, weight per unit volume, normality, etc.

Corrosive
A substance that causes visible destruction or permanent changes in human skin tissue at the site of contact.

Cutaneous
Pertaining to or affecting the skin.