As stated by the EPA, “PAHs are released to air during incomplete combustion of fossil fuel such as diesel, gasoline, coal, and other organic material. When inhaled by the mother during pregnancy, PAHs can be transferred across the placenta.” Click here to read more on the EPA’s Office of Extramural Research about Dr. Perera’s studies that were funded in part by the EPA. It’s evident that the EPA recognizes that Polycyclic Aromatic Hydrocarbons (PAHs) can also be defined as Particles Are Harmful (PAH). If the EPA did not believe there are destructive health effects of PAHs, then they wouldn’t fund this particular type of research.