• found
  • PAHs have been found in at least 600 of the sites on the NPL. (cdc.gov)
  • As EPA evaluates more sites, the number of sites at which PAHs are found may increase. (cdc.gov)
  • PAHs are abundant in the universe, and have recently been found to have formed possibly as early as the first couple of billion years after the Big Bang, in association with formation of new stars and exoplanets. (wikipedia.org)
  • health effects
  • It is one in a series of Public Health Statements about hazardous substances and their health effects. (cdc.gov)
  • If you are exposed to substances such as PAHs, many factors will determine whether harmful health effects will occur and what the type and severity of those health effects will be. (cdc.gov)
  • rings
  • PAHs with five or six-membered rings are most common. (wikipedia.org)
  • citation needed] In contrast, in anthracene the resonance structures have one sextet, which can be at any of the three rings, and the aromaticity spreads out more evenly across the whole molecule. (wikipedia.org)