U.S. EPA's Preferred Regulatory Model 

AERMOD is the state-of-the-science, steady-state Gaussian air dispersion model that is EPA-approved for most refined modeling scenarios. BREEZE AERMOD is an enhanced version of the EPA-approved AERMOD that provides modelers with the tools and functionality required to perform air quality analyses that help to address permitting, regulatory, and nuisance issues, perform academic research, and assist companies worldwide with capital planning. BREEZE AERMOD offers the most complete air quality modeling system available on the market today. No other application is used by more air quality professionals around the world.

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  • Adds a tool that enables users to convert surface meteorological data to a SAMSON file format, which can then be used to process AERMOD-ready meteorological data using AERMET. In cases when surface met data is not in an AERMET-ready format, it can be a tricky and tedious process to convert it. Therefore, with this conversion tool built into the software, users can easily convert surface met data into a SAMSON format to run AERMET, and will save time and money by streamlining this process.
  • Updated the DWG import function to support DWG/DXF files created by the latest AutoCAD 2021 and earlier versions, as well as text, multiline text and ellipse entity types. This update allows users to import more DWG objects, which can provide a more detailed base map to define model objects in BREEZE AERMOD.
  • Includes the latest  U.S. EPA AERMOD 19191 executable and  U.S. EPA BPIPPRM 19191_DRFT executable
  • Preserves compatibility with U.S. EPA AERMOD versions 18081, 16216r, 15181, 14134, 13350, 12345, 12060, 09292, and 07026
  • Includes a basic, merge-only version of BREEZE AERMET and a basic version of BREEZE MetView
  • Streamlines graphical user interface for more intuitive and easier dispersion modeling
  • Automates importing of a geo-referenced basemap file with certain data file format
  • Generates an aligned or geo-referenced file after manually importing a basemap and geo-referencing it
  • Imports 2D and 3D geometric data with AutoCAD's .dwg/dxf file formats
  • Simplifies the setup of pre-modeling objects with a variety of utilities
  • Analyzes post-modeling results using BREEZE 3D Analyst, tables for sensitive receptors, and 3D visuals for surface terrain

Product Tour

Parallel Processing

To combat the increased runtimes observed with EPA's AERMOD, BREEZE created a parallel processing version to slash runtimes through the use of a distributed computer network (cluster) or multi-CPU environment. Our high performance applications produce pollutant concentration estimates identical to EPA's Fortran executable.  The only code changes to the application are additions to implement parallel features.  The applications run the exact algorithms but on different processors. There are two... Learn more



Assigning the model ready historical meteorological data in BREEZE AERMOD is easy.  Simply select the files to use with a particular scenario.  BREEZE will identify the period that the data set is valid for and display the station ID so that there are no mistakes setting up the input file.  BREEZE MetView, a companion product, interprets model results from the meteorological point of view. Learn more



BREEZE AERMOD allows you to model the standard U.S. EPA sources (i.e., point, area, volume, open pit and EPA area line) and exclusive BREEZE sources such as flare and BREEZE area line sources. In addition, BREEZE offers object array generators that create user defined arrays (e.g., polylines, polygons, and Cartesian grids) of the model object type. Source elevations can also be processed with the embedded U.S. EPA AERMAP program. Learn more



AERMOD takes into account the obstruction of wind flow from structures, such as buildings and point sources (i.e., stacks). Like any other model object in BREEZE AERMOD, buildings can be copied and pasted or drawn into the 2D display. Building information can be processed with the embedded U.S. EPA BPIP Prime program. Learn more



Receptors are locations where BREEZE AERMOD will compute a concentration or deposition value. At least one receptor must be defined. Receptor elevations can also be processed with the embedded U.S. EPA AERMAP program. Learn more


Scenario Development Tools

BREEZE AERMOD provides a variety of tools to facilitate the setup of model or the analysis of results.Ozone file, hourly emission file, and AERMOD input file editorsXYZ2DEM Utility to convert XYZ terrain files to digital elevation model (DEM) formatCoordinate Converter to convert one coordinate to anotherAERMET, 3D Analyst, and MetView access if they are pre-installedBRMS merger to merge BRMS results which can then be read by 3D AnalystBlank on-site or off-site receptors toolImport tool to... Learn more


ISC Model

BREEZE AERMOD suite includes the Industrial Source Complex (ISC) short-term model.  ISC predicts pollutant concentrations from nearly any type of source emitting non-reactive pollutants. It allows you to define receptor grids and consider topographical features for each receptor location. You are also able to input above ground-level heights to simulate the impact at elevated or “flagpole” receptors. BREEZE ISC also predicts pollutant concentrations from: point, line, area, volume, and flare... Learn more


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Related Products & Services

  • Model-ready meteorological and geophysical data for the AERMOD and AERMET models

  • Custom EHS, modeling, and programming solutions for your organization's needs

  • Process meteorological data for input into the BREEZE AERMOD dispersion model

  • Meteorological data analysis and two dimensional visualization tool

  • Understand visually the effects of building downwash in AERMOD

  • A screening model based on the U.S. EPA AERMOD air quality dispersion model

  • Air dispersion screening tool used to analyze multiple sources

  • A multi-layer, multi-species non-steady-state puff dispersion model

  • Advanced human health risk assessment add-in for Esri ArcGIS®

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