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Guidance for Air Dispersion Modeling

Information for Air Dispersion Modeling.

TCEQ Air Quality Modeling Guidelines

The TCEQ Air Permits Division has updated the air quality modeling guidelines to reflect EPA’s final Modeled Emission Rates for Precursors memorandum. The purpose of the document is 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 Quality Modeling Guidelines, APDG 6232, September 2018.

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 on how to submit the Modeling Request Form. Additional information on the retrieval can be found in the Modeling Request Fact Sheet.

Monitoring Data

Elevation Data

National Elevation Dataset (NED) terrain data can be obtained as a GeoTIFF to use in AERMAP from the Multi-Resolution Land Characteristics Consortium (MRLC).Exit the TCEQ

How to download NED data as a GeoTIFF from the MRLC Consortium Viewer:

  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. Enter limits for the area and then click “Add Area”
  5. On the next screen, click on “Modify Data Request” in order to download the NED data as a GeoTIFF
  6. Check the box next to “National Elevation Dataset (NED) 1/3 Arc Second” and uncheck any other boxes
  7. After page loads, select GeoTIFF for the Data Format
  8. Click “Save Changes and Return to Summary”
  9. Click Download to save or open the files

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