Air Quality Evaluation and Planning Section/Modeling

In the Division of Air Pollution Control (DAPC), the Air Quality Evaluation and Planning Section modeling staff perform original modeling studies and review reports of modeling studies submitted by other parties, as well as provide data analysis and resources in support of many projects performed by the section.

Air Dispersion Modeling is an evaluation technique used to characterize pollution resulting from the operation of a source or group of sources. Ohio Revised Code (ORC) 3704.03 provides the Director with authority to require modeling in adoption of rules and in issuance of permits. The federal Clean Air Act requires modeling in conjunction with classification of air quality areas, preparation of state implementation plans (SIPs) and review of new sources. U.S. EPA-approved models are applied using protocols that follow the U.S. EPA Air Modeling Guideline (40 CFR Part 51 Appendix W) with few exceptions for modeling performed and reviewed by the modeling staff.

NOTE: As of April 1, 2020, Ohio EPA will no longer accept SCREEN3 modeling for State-only permit applications.  Screen modeling should be conducted with U.S. EPA’s preferred screening model, AERSCREEN.  The Division of Air Pollution Control will be updating Engineering Guide 69 to reflect this change in the near future.

Several resources are available through links in the following list to assist with modeling.

State and Federal Modeling Resources

U.S. EPA Modeling Guidance and Support


For more information, please contact Jennifer Van Vlerah.