Skip to Main Navigation
Skip to Page Content
COVID-19 is an emerging, rapidly evolving situation.

Get the latest public health information from CDC and research information from NIH.

U.S. flag

An official website of the United States government

Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Share This:
https://ntp.niehs.nih.gov/go/PAHs

NTP Review of Polycyclic Aromatic Hydrocarbons (PAHs)

 Polycyclic aromatic hydrocarbons

Substance Overview

PAHs are defined as compounds containing at least two adjacent 6 carbon rings and only carbon and hydrogen.

Status: Cancer hazard evaluation for potential listing in the Report on Carcinogens (RoC)

Primary Uses or Exposures

  • PAHs are widespread in the environment.
  • PAHs are common byproducts of combustion of organic substances. PAHs also are found in coal tar, coke, asphalt, and coal.
  • People are typically exposed to a mixture of PAHs, rather than an individual PAH.
  • People in the US are mainly exposed to PAHs via inhalation of smokes (tobacco, wood, coal, etc.) and other air pollutants, and ingestion food containing PAHs (e.g., grilled meat).  Workers at workplaces which use or producing petroleum or coal, or burn organic material, and other facilities might be exposed to PAHs.

 

Documents

Documents for PAHs
Date Document
Sep 20, 2013 Federal Register notice requesting public comment on nominated substances (PDF HTML)

Note on Accessibility: Persons with disabilities or using assistive technology may find some documents are not fully accessible. For assistance, email us or use our contact form and identify the documents/pages for which access is required. We will assist you in accessing the content of these files. NIEHS has helpful information on accessibility.