Polycyclic aromatic hydrocarbons (PAHs)
PAHs are a group of more than 100 different chemicals and generally occur as complex mixtures. They can come from natural sources or human activity. They are known to cause cancer and other health issues, as well as environmental impacts.
We work with the Washington State Department of Health, along with industry and environmental stakeholders, to identify and take action to phase out the use of PAHs in Washington.
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Health and environmental impacts of PAHs
PAHs are formed during the incomplete burning of organic matter such as burning coal, oil, gasoline, diesel, wood, or garbage. The highest rates of exposure to people come from:
- Charred or barbecued food.
- Smoking cigarettes and secondhand smoke.
- Burning wood in wood stoves and fireplaces.
- Breathing in wildfire smoke.
Other products that release PAHs to the environment include:
- Creosote-treated wood.
- Vehicles (emissions, tire wear, improper motor oil disposal, and leaks).
- Sealants used on asphalt (e.g., coal tar sealants).
Studies show that PAHs can cause:
- Cancer.
- Reproductive problems.
- Weakened immune systems.
Learn more about health and environmental impacts of PAHs.
Actions to address PAHs in Washington
Our agency, along with the Washington State Department of Health, has programs in place to reduce PAHs released from wood smoke, diesel, and creosote. Many organizations and local, state, and federal agencies also work to reduce emissions from combustion and clean up contaminated soils and treated wood structures.
- 2012 — Chemical action plan for PAHs is finalized.
- 2011 — Washington bans coal tar pavement sealants (RCW 70A.440.020).
Related links
Contact information
Chemical Action Plans Team
ChemActionPlans@ecy.wa.gov