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.

 As a precautionary response to COVID-19, Ohio EPA is currently operating with most staff working remotely. If you are working with our staff on a current project and you know the name of the employee you are working with, email them at or call them directly. The Agency website has contact information for every district, division, and office. In order to reach us, please contact Ohio EPA’s main phone line at (614) 644-3020 or the main line for the division or office you are trying to reach.

After March 23, our district offices and Central Office will be temporarily closed and will have increasingly limited ability to receive deliveries, plans, etc. All entities are encouraged to submit plans, permit applications, etc., electronically where there are existing avenues to do so, such as the eBusiness Center (eBiz). Please refer to the list of available services on the main eBiz webpage. We encourage you to make use of all that apply, even if you have not used eBiz in the past. Plans under 25 MB can be emailed. For large plans over 25 MB, entities should work with the reviewer/division to upload via LiquidFiles. Directions for submitting docs via LiquidFiles is available on YouTube. We apologize for the inconvenience and thank you in advance for your understanding. If you wish to send hard copies of documents to any of Ohio EPA’s district offices, the best method to ensure we receive these documents is to send them via U.S. Mail. Since all offices are closed, deliveries outside of U.S. Mail (FedEx, UPS) will likely be returned because the offices are closed and deliveries cannot be made.

To report a spill or environmental emergency, contact the spill hotline (800) 282-9378 or (614) 224-0946