Cleaner Air Oregon

The goal of the Cleaner Air Oregon program is to evaluate the potential health risks to people who live, work, or play in areas impacted by regulated toxic air contaminants emitted from permitted industrial facilities, and ensure those risks meet health-based standards. DEQ has compiled technical resources to assist regulated sources and their consultants in the CAO health-risk assessment process.

Administrative Forms and Fees


Emissions Inventory Resources


Modeling Resources

  • Draft Modeling Procedures: The draft modeling procedures document includes all regulatory modeling demonstrations, including New Source Review and Cleaner Air Oregon.
  • Dispersion factor tables for modeling emissions for a Level 1 risk assessment [OAR 340-245-8050 Table 5]

Risk Assessment Tools

  • List of Toxic Air Contaminants in Proposed Noncancer Hazard Index Rules: Lists the 156 chemicals with developmental or other severe human health effects and the 26 chemicals not expected to have developmental or other severe health effects. There is also a detailed table of the 156 chemicals, which shows the lines of evidence used to identify that a chemical is expected to have developmental and/or other severe health effects.  

Authoritative Sources

  • United States Agency for Toxic Substances and Disease Registry: The ATSDR is a federal public health agency within the United States Department of Health and Human Services. The agency focuses on minimizing human health risks associated with exposure to hazardous substances.
  • EPA Integrated Risk Information System (IRIS): EPA’s IRIS Program supports this mission by identifying and characterizing the health hazards of chemicals found in the environment. Each IRIS assessment can cover a chemical, a group of related chemicals, or a complex mixture.
  • EPA Provisional Peer-Reviewed Toxicity Values: EPA’s PPRTV Program supports the Agency’s mission to protect human health and the environment by identifying and characterizing the health hazards of, and providing an important source of toxicity information and toxicity values for, chemicals of concern to the Superfund Program.
  • California Office of Environmental Health Hazard Assessment: OEHHA is the lead state agency for the assessment of health risks posed by environmental contaminants.