Judith Enck, the regional administrator for the U.S. Environmental Protection Agency, notes that «from their designation as probable human carcinogens to their well - documented immunologic, neurologic and reproductive health effects, long - term exposure to PCBs is cause for considerable concern.» (uft.org)
«Both formaldehyde and 1,4 - dioxane cause cancer in animals, and formaldehyde was recently classified as a known human carcinogen by the U.S. National Toxicology Program. (mommyish.com)
Many sanitary products contain dangerous chemicals such as bleach and dioxins which are known as human carcinogens. (treehugger.com)