Skip to content. | Skip to navigation

Personal tools


Complaint Arrow Questions or Comments:
You are here: Home / Permits, Registrations, and Reporting / Air Permits / Guidance / NSR / Guidance for Air Dispersion Modeling

Guidance for Air Dispersion Modeling

Information for Air Dispersion Modeling.

TCEQ Air Quality Modeling Guidelines

The TCEQ Air Permits Division has finalized the air quality modeling guidelines Adobe Acrobat PDF Document to provide staff with a process to evaluate and determine air quality impacts analysis requirements for case-by-case permit reviews. While the focus of the document is on the technical review process, it is available to the regulated community and the public to provide an understanding of air quality impacts analysis requirements and processes that affect air permit applications. This final document will supersede Air Dispersion Modeling Guidelines, RG-25, February, 1999.

In addition, the division had solicited comments on the draft guidance. The submitted comments Adobe Acrobat PDF Document and response to comments Adobe Acrobat PDF Document are posted here for convenience.

If you have any questions about this guidance, please contact the TCEQ Air Permits Division at 512-239-1250.

Off Property Source Inventory

The TCEQ has replaced the Point Source Database (PSDB) with the Air Permits Allowable Database (APAD) as the data source for generating modeling retrievals. The new procedure to request modeling retrievals is similar to the previous one, but there are some minor differences. Please refer to the guidance outlined in the How to Request Modeling Retrieval Adobe Acrobat PDF Document on how to submit the Modeling Request Form. Additional information on the retrieval can be found in the Modeling Request Fact Sheet. Adobe Acrobat PDF Document

Monitoring Data

Elevation Data

  1. Click the “Data” button (located in the top right corner of your browser)
  2. Click “Download Tool”
  3. Click “Define Download Area by Coordinates” button
  4. After the boundaries are submitted, click on “Modify Request” in order to download the NED data as a GeoTIFF


Environmental Trade Fair – The ADMT’s presentations at the Environmental Trade Fair held annually in Austin, Texas.

Advanced Air Permitting Seminar - The ADMT’s presentations at the Advanced Air Permitting Seminar held annually in Austin, Texas.

Stephen F Austin State University - The ADMT’s presentations to a class in the division of environmental science at SFAU.

EPA - EPA’s presentations Exit the TCEQ at air dispersion modeling conferences.

Questions? We Can Help

If you have questions contact us.