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Air Quality

Air Quality Data and Dispersion Modeling

Modeling Data

Unless otherwise noted, all documents listed below are in pdf or doc format.

Background Concentrations for Modeling Purposes (9/13/2012)

Pre-processed, NWS Meteorological Data Sets, 2002-06 For use in AERMOD in SC

Pre-processed, NWS Meteorological Data Sets, 2002-06
For use in AERMOD in SC

The state has been divided into 12 areas such that the meteorological station/data assigned to each area is deemed by DHEC's Bureau of Air Quality (BAQ) to be the most representative, in general, for AERMOD modeling purposes for that area and should be used as the default data for a given area. [Note: these area-station associations supersede those in Table 5.1 (page 36) in "Air Quality Modeling Guidelines" of July 2001.] Please contact BAQ with any questions/issues or unusual circumstances. For PSD permit modeling, choice of meteorological data should be discussed with BAQ prior to modeling.

IMPORTANT NOTE (27-Dec-2012)

  • AERMOD version 12345 was released by EPA on 17-Dec-2012 and should be used for all refined permit modeling performed after that date.
  • This version of AERMOD requires meteorological input files that have been processed with AERMET version 12345 (or 11059, but 12345 is preferred).
  • The meteorological data sets posted on this website were processed with AERMET version 06341 and therefore would be incompatible with AERMOD version 12345.
  • To allow these meteorological data sets to be used with this latest AERMOD version, DHEC altered the header line inside each ".SFC" file (the ".PFL" files do not have a header line) by replacing “Version: 06341” with “Version: 12345”. No other changes were made to the files, except they (".SFC", ".PFL" and ".zip" files) were renamed by appending “_rev” to the filenames to distinguish them from the previous unaltered sets.
  • This is a temporary, interim measure to facilitate non-Prevention of Significant Deterioration (non-PSD) permit modeling using AERMOD version 12345 until DHEC can fully update the meteorological data sets at a later date. Applicants performing modeling for a PSD permit should contact John Glass (803-898-4074) to discuss the AERMET files that should be used for that modeling.

5-Year Concatenated AERMET Data (special case AERMOD modeling only)

Download-by-County Table


The meteorological (AERMET) data provided by BAQ is solely intended to be used for regulatory AERMOD modeling analyses for sources located in South Carolina ONLY. Please be mindful that these data sets are subject to change based on pending comments and guidance from EPA. Please contact BAQ modeling section manager at (803) 898-4074 should you have any questions about the use of these data sets.

Digital Terrain Data: National Elevation Dataset (NED) for use with AERMOD

Note: DHEC requires the use of NED [vs. Digital Elevation Model (DEM)]
starting February 1, 2010

This NED data covering South Carolina was obtained from the United States Geological Survey (USGS). They are made available here for use with regulatory AERMOD modeling analyses for sources located in South Carolina. The data is in county divisions at 1 arc-second (approximately 30-meter) horizontal resolution in GeoTIFF format.

Please note that these data sources may occasionally be updated by USGS. The NED data sources on this webpage were last updated on May 13, 2013. If you have questions about these data sources, please contact the BAQ modeling section manager at (803) 898-4074.

Ambient Air Quality Data Summaries

For more information please contact the Bureau of Air Quality at (803) 898-4123 or by email.