The [[National Toxicology Program]] (NTP), of the [[U.S. Department of Health and Human Services]], classifies carcinogens in two categories: ''Known'', and ''Reasonably anticipated''.<ref name="NTP">National Toxicology Progam: [http://ntp.niehs.nih.gov/index.cfm?objectid=03CA6383-9766-1F64-6637241FE0114FE9 Questions & Answers about the RoC].</ref> Since 1978, it has produced a list of carcinogenic material along with federal regulations limiting exposure.<ref name="NTP"/> | The [[National Toxicology Program]] (NTP), of the [[U.S. Department of Health and Human Services]], classifies carcinogens in two categories: ''Known'', and ''Reasonably anticipated''.<ref name="NTP">National Toxicology Progam: [http://ntp.niehs.nih.gov/index.cfm?objectid=03CA6383-9766-1F64-6637241FE0114FE9 Questions & Answers about the RoC].</ref> Since 1978, it has produced a list of carcinogenic material along with federal regulations limiting exposure.<ref name="NTP"/> |