Download EPA's Most Used Air Quality Models

In this section, Lakes Environmental brings you EPA's most used air quality models and guidelines. To download these files click on the highlighted filename.

Note: Your Web browser (Netscape, IE, etc.) might complain that the files to be downloaded are in an unknown format and asks you to save to file. Click Yes and your files will be downloaded.

Please refer to this section periodically, since we are updating it with new codes.

AERMOD ---Latest release (99351)---

Screening Procedures:

SCREEN3 | TSCREEN | VISCREEN | CTSCREEN

Regulatory Models:

Emergency Release Models:

SLAB | DEGADIS

Related Programs:

Modeling Guidance:

GAQM - Appendix W

Screening Procedures

SCREEN3

SCREEN3 is used to estimate maximum ground-level concentration for a single source (point, flare, area, or volume) and can be used for flat or elevated terrain.

Click the filename to download the file.

SCREEN3D.ZIP 73,099 bytes 9/14/95(SCREEN3 User's Guide)
SCREEN3.ZIP 155,090 bytes 9/14/95 (SCREEN3.EXE, Source Code, README.TXT)

Lakes Interface for SCREEN3: Screen View
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TSCREEN

Screening model for determining maximum short-term impact from toxic releases.

Click the filename to download the file.

TSCREEN1.ZIP 567,607 bytes 12/02/92 (TSCREEN, File 1)
TSCREEN2.ZIP 193,114 bytes 12/02/92 (TSCREEN, File 2)
TSCREEN3.ZIP 342,711 bytes 10/02/95 (TSCREEN, File 3)
TSCREEN4.ZIP 182,152 bytes 10/02/95 (TSCREEN, File 4)
TSCRCODE.ZIP 418,871 bytes 10/02/95 (TSCREEN Source Code)
TSCREEND.ZIP 40,448 bytes 07/24/94 (TSCREEN User's Guide - WP 5.1)
TSCRD1.ZIP 345,611 bytes 06/15/93 (TSCREEN Workbook, File 1)
TSCRD2.ZIP 598,241 bytes 06/15/93 (TSCREEN Workbook, File 2)
TSCRD3.ZIP 693,239 bytes 06/15/93 (TSCREEN Workbook, File 3)
TSCRD4.ZIP 438,688 bytes 06/16/93 (TSCREEN Workbook, File 4)
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VISCREEN

Initial screening model for visual impact caused by emissions to the atmosphere.

Click the filename to download the file.

VISCREEN.ZIP 121,369 bytes 08/11/92 (PC version EXE Included)
VISCRDU.ZIP 35,813 bytes 07/16/93 (User's Guide Update-WP 5.1)
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CTSCREEN

Complex terrain screening model of CTDMPLUS.

Click the filename (highlighted in blue) to download the file.

CTSCRN1.ZIP 332,248 bytes 03/30/94 (Readme, PC EXE, Test Case)
CTSCRN1E.ZIP 254,194 bytes 03/30/94 (Extended memory executable)
CTSCRN2.ZIP 125,887 bytes 05/25/94 (Source Code)
CTSCSUP.ZIP 12,823 bytes 03/17/93 (Supplement to User's Guide)
CTPLSMOD.ZIP 117,813 bytes 03/18/93 (Report on modifications to CTSCREEN/CTD)
CTSCREEN.ZIP 109,925 bytes 04/30/91 (User's Guide-WP 5.1)
CT-NOTES.TXT 9,904 bytes 08/09/93 (Notes on Terrain Input to CTDM+/CTSCREEN)

Regulatory Models

ISCST3 - Industrial Source Complex - Short Term

Used in more detailed studies of maximum air quality impacts (Phase 3-Refined Modeling Analysis). The purpose is to compute short term concentration or deposition values, from multiple sources, on specified locations (i.e., receptors).

Click the filename to download the file.

This is the latest version of the regulatory model ISCST3 (02035) which was released by U.S. EPA on Feb 4, 2002.

ISCST.ZIP 1.70 MB 02/04/02 (Executable, Source, Test Cases)

Click Here For ISCST3 Model Evaluation References

Lakes Interface for ISCST3: ISC-AERMOD View
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ISCLT3 - Industrial Source Complex - Long Term

ISC3 Long Term dispersion model is used to model emissions with long-term averaging periods.

Click the filename to download the file.

ISCLT3-L.ZIP 220,542 bytes 09/18/95 (ISCLT3 *.EXE(Lahey))
ISCLTSRC.ZIP 134,493 bytes 09/18/95 (ISCLT3 Source Code (Lahey and Microsoft))
AREALTL.ZIP 7,787 bytes 09/18/95 (Area Source Test Case (Lahey))
DEPLTL.ZIP 6,647 bytes 09/18/95 (Deposition Test Case (Lahey))
TEST-LTL.ZIP 19,979 bytes 09/18/95 (Original ISCLT Test Case (Lahey))
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ISC3 User's Guide (ISCST3 & ISCLT3)

Click the filename to download the file.

ISC3V1.PDF 1.16Mb (User's Guide - Volume 1 - with Addendum)
ISC3V2.PDF 570 Kb (User's Guide - Volume 2 - with Addendum)

ISC3UG.ZIP 552 Kb 04/27/00 (User's Guides - All Volumes - WP format))
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ISC-PRIME - Industrial Source Complex - Plume RIse Model Enhancements

ISC-PRIME dispersion model is being evaluated as the next generation building downwash model. This version of the ISC model has a new set of algorithms and has been named ISC-PRIME. The files below are made available for review and evaluation.

Click the filename to download the file.

ISCPRIME.TXT 6.07 KB 08/24/98 (ISC-PRIME ReadMe (Read First))
USEGUIDE.PDF 229 KB 08/24/98 (ISC-PRIME User's Guide)

ISCPRMSR.ZIP 213 KB 1/28/99 (ISC-PRIME and BPIPPRM source codes)
PRMTESTS.ZIP 624 KB 1/28/99 (ISC-PRIME and BPIPRM Executables, Met Data and Test Cases)

PRIMPLDN.PDF 589 KB 10/25/99 (Draft: Development and Evaluation of the PRIME Plume Rise and Building Downwash Model)
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AERMOD

AERMOD is the next generation air dispersion modeling system and consists of 3 components - AERMOD (air dispersion model), AERMET (meteorological data preprocessor) and AERMAP (terrain preprocessor). A brief overview of the model can be found in the mod-desc.txt file below.

Click the filename to download the file.

MOD-DESC.TXT 2.39 Kb 1/11/99 (Brief description of AERMOD)
DEGRADE.ZIP 45.9 Kb 12/14/98 (Min. met data recommendations and analysis - WP format)
FIGDEG.ZIP 478 Kb 12/14/98 (Figures for DEGRADE file - BMP format)

AERMODUG.PDF 624 Kb 11/10/98 (AERMOD User's Guide)
AERMETUG.PDF 454 Kb 11/30/98 (AERMET User's Guide)
AERMAPUG.PDF 127 Kb 11/10/98 (AERMAP User's Guide)

AERMOD.ZIP     305 Kb 04/24/00 (AERMOD Executable)
AERMODEX.ZIP   23 Kb 04/24/00 (AERMOD Test Case)
AERMODSR.ZIP 203 Kb 04/24/00 (AERMOD Source Code)
AERMET.ZIP      457 Kb   02/14/00 (AERMET Executable)
AERMETEX.ZIP    45 Kb 12/06/99 (AERMET Test Case)
AERMETSR.ZIP 204 Kb 12/06/99 (AERMET Source Code)
AERMAP.ZIP      190 Kb 12/06/99 (AERMAP Executable)
MAPTEST.ZIP    1.53 Mb 12/06/99 (AERMAP Test Case)
AERMAPSR.ZIP   57 Kb 12/06/99 (AERMAP Source Code)
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CALINE3 (California Line Source Dispersion Model)

Air quality models used to predict pollutant concentration near roadway intersections. CAL3QHC is an enhanced version of CALINE3, with the additional traffic algorithm to estimate vehicular queue lengths at intersections with traffic stop lights. We recommend that you get both models. The theoretical information regarding the CALINE3 implementation in CAL3QHC is only presented in CALINE3 User's Guide.

Click the filename to download the file.

CALINE3.ZIP 52,564 bytes 06/13/91 (PC version EXE included)
CALINE3D.ZIP 23,009 bytes 08/31/93 (CALINE3 WP Format)
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CALINE4 (California Line Source Dispersion Model)

CALINE4 is a modeling program to assess air quality impacts near transportation facilities. It is based on the Gaussian diffusion equation and employs a mixing zone concept to characterize pollutant dispersion over the roadway. CALINE4 comes with a Windows user interface.

Click the filename to download the file.

ZCALINE4.EXE    2,127KB 04/13/99 (Windows Interface and EXE included)
CL4GUIDE.PDF     390 KB 09/10/98 (User's Guide for CALINE4 Interface)
CALINE41989.PDF 7.7 MB      06/89 (Manual for the CALINE4 Model)
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CAL3QHC

See description for CALINE3

Click the filename to download the file.

CAL3QHC.ZIP 323,189 bytes 10/19/95 (PC version EXE included)
CAL3QHCD.ZIP 130,608 bytes 10/19/95 (User's Guide/WP 5.1-CAL3QHCR Addendum included)
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FDM

FDM (Fugitive Dust Model) is an air quality model designed for computing concentration and deposition impacts from fugitive dust sources.

Click the filename to download the file.

FDM1.ZIP 383,939 bytes 10/08/93 (FDM.EXE, Source Code, and Readme.txt)
FDM2.ZIP 389,660 bytes 10/07/93 (FDM test case and postprocessor)
FDMD.ZIP 116,736 bytes 10/07/93 (FDM User's Guide in WP5.1)

Emergency Release Models

SLAB

SLAB is an atmospheric dispersion model for denser-than-air releases. Four types of releases can be treated by the model: a ground-level evaporating pool, an elevated horizontal jet, a stack or elevated jet, and an instantaneous volume source.

Click the filename to download the file.

SLAB.ZIP 111,139 bytes 04/06/94 (SLAB Model for dense gas dispersion)

Lakes Interface for SLAB: SLAB View

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SLAB User's Manual (Full Version)

SLAB.PDF 6.09 MB 11/18/99 (SLAB User's Manual - Adobe Acrobat)

SLAB User's Manual (Abridged Version)

Click the filename to download the file. Choose one file only!

SLABMAN.PDF 385,339 bytes 08/26/97 (SLAB User's Manual - Adobe Acrobat) See Note 1
SLABMPS.ZIP 395,495 bytes 07/08/97 (SLAB User's Manual - Postscript) See Note 2

Note 1: To read and print PDF files, you will need the Adobe Acrobat Reader. If your browser does not support PDF files yet, you may download the Adobe Acrobat Reader, free of charge, at http://www.adobe.com

Note 2: If you downloaded the SLABMPS.ZIP, then unzip this file and in a DOS window give the following command:

COPY SLABMPS.PRN LPT1: (This file can be printed on postscript printers only). If you are using Windows 95/98 or NT, drag the file and drop over your printer icon.

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DEGADIS

DEGADIS is a mathematical dispersion model that can be used as a refined modeling approach to estimate short-term ambient concentrations and the expected area of exposure to concentrations above specified threshold values for toxic chemical releases.

Click the filename to download the file.

DEGSRC.ZIP 265,013 bytes 09/15/92 (DEGADIS Fortran Source Code)
DEGEXE.ZIP 691,191 bytes 11/24/92 (DEGADIS executable)
README.DOC 33,654 bytes 08/24/92 (Installation and information)
DEGUGV1.PDF 2.50 MB 11/18/99 (Technical Document)
DEGUGV2.PDF 3.77 MB 11/18/99 (DEGADIS User's Guide)

Related Programs

BPIP

BPIP (Building Profile Input Program) calculates building downwash, building heights and projected building widths, for input into ISC3 model (ISCST3 and ISCLT3).

Click the filename to download the file.

BPIP.ZIP 91,105 bytes 04/03/95 (BPIP executable, FORTRAN code, README.TXT)
BPIPD.ZIP 52,326 bytes 02/16/95 (BPIP User's Guide)

Lakes Interface for BPIP: BPIP View
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PCRAMMET

PCRAMMET is a very useful utility program to convert meteorological data from National Weather Service (NWS) to be used by EPA's short term air quality dispersion models such as ISCST3.

Click the filename to download the file.

PCRAMMET.ZIP 296 Kb 2/12/99 (PCRAMMET *.EXE, README.TXT)
PCREX1.ZIP       254 Kb 2/12/99 (PCRAMMET simulated Year 2000 HUSWO example)
PCREX2.ZIP       403 Kb 2/12/99 (PCRAMMET SAMSON example)
PCREX3.ZIP       175 Kb 2/12/99 (PCRAMMET SCRAM example)
PCREX4.ZIP       323 Kb 2/12/99 (PCRAMMET CD144/TD3240 variable format example)
PCREX5.ZIP       323 Kb 2/12/99 (PCRAMMET D144/TD3240 fixed format example
PCRMCODE.ZIP   52 Kb 2/12/99 (PCRAMMET source code)
PCRAMTD.PDF   157 Kb 2/12/99 (PCRAMMET User's Guide)

Lakes Interface for PCRAMMET: Rammet View
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BINTOASC

This is a utility program that converts unformatted (binary) meteorological data files generated by the RAMMET, PCRAMMET, or MPRM preprocessor programs to the default ASCII format for applications that do not involve dry deposition.

Click the filename to download the file.

BINTOASC.EXE 46,848 bytes 03/02/92 (BINTOASC.EXE)
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WRPLOT

WRPLOT is an interactive program to generate wind rose statistics and plots for user-specified date and time ranges. Wind roses are useful to define the dominant transport direction of the winds for a location.

Click the filename to download the file.

WRPLOT.ZIP 1,087,308 bytes 02/10/93 (Wind Rose Plotting Program)

Download FREE Lakes Wind Rose Windows Program: WRPLOT View
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STAR

The STAR program summarizes National Weather Services (NWS) meteorological data, by generating joint frequencies of 6 wind speeds, 16 wind directions and 6 stability categories for the station and time period desired.

Click the filename to download the file.

STAR.ZIP 215,700 bytes 02/11/94 (STAR Program, Test Files)
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WINDROSE

Click the filename to download the file.

WINDROSE.ZIP 284,722 bytes 10/24/95 (WINDROSE Program, Test Files)

Modeling Guidance

Guideline on Air Quality Models - GAQM

This guideline is the regulatory document that recommends air quality modeling techniques that should be applied to different set of conditions. This document is also referred to as "Appendix W of CFR Part 51" (where CFR stands for Code of Federal Regulations).

Click the filename to download the file.

APPW_01.PDF 528 Kb 09/27/01 (Guideline on Air Quality Models)