Benzene: A natural part of crude oil, benzene is a known human carcinogen. Long-term exposure has been linked to anemia and leukemia. Read More.
Butadiene: A product of the petroleum refining process, butadiene is a known human carcinogen that has been linked to various types of cancer. Read More.
Hydrogen sulfide: Hydrogen sulfide can be found in crude petroleum. In low concentrations, the chemical may cause eye, nose or throat irritation, and brief exposure to high concentrations may cause loss of consciousness or even death. Read More.