other sources refute this Crude oil according to the National Library of Medicine Crude Oil Crude Oil Crude oil toxtown.nlm.nih.gov... website Tox Town: Crude Oil website http://toxtown.nlm.nih.gov/text_version/chemicals.php?id=73 http://toxtown.nlm.nih.gov/text_version/chemicals.php?id=73 burning crude oil Crude Oil