Polycyclic aromatic hydrocarbons (PAHs) are a class of chemicals that occur naturally in coal, crude oil, and gasoline.
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.Polycyclic aromatic hydrocarbons (PAHs) are a class of chemicals that occur naturally in coal, crude oil, and gasoline.
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.