Modeling Software for EHS Professionals

AERMOD is a steady-state Gaussian dispersion model that represents the current state-of-science and promulgated dispersion model from the U.S. EPA. 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 both permitting, regulatory, and nuisance issues as well as perform academic research. BREEZE AERMOD/ISC 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.

Key Features
  • Integrates the most recent U.S. EPA AERMOD version 14134, released on May 16, 2014, including high-speed parallel and BREEZE-enhanced versions of the new executable
  • Features an option to change the processing of 1-hour NO2, 1-hour SO2, and 24-hour PM2.5 results, depending on whether modeling is being done for the U.S. NAAQS standards or some other standard
  • Includes a basic, merge-only version of BREEZE AERMET and a basic version of BREEZE MetView
  • Streamlined graphical user interface for more intuitive and easier dispersion modeling
  • Streamlines NO2, SO2 and PM2.5 modeling for U.S. NAAQS
  • Incorporates the Ambient Ratio Method (ARM) and ARM2 for NO2 modeling
  • Models an unlimited number of sources and receptors
  • Models numerous source types including point / stack (vertical, horizontal and capped), area, volume, open pit, flare, BREEZE area line and EPA area line
  • Models numerous receptor types including discrete Cartesian grid, polar grid, and variable density grid
Product Tour

U.S. EPA AERMOD incorporates air dispersion based on planetary boundary layer turbulence structure and scaling concepts, including treatment of both surface and elevated sources, and both simple and complex terrain. There are two regulatory components of EPA’s AERMOD:

  • AERMET - a meteorological data preprocessor (available as a separate BREEZE application)
  • AERMAP - a terrain data preprocessor (embedded in BREEZE AERMOD)


Non-regulatory components of EPA’s AERMOD include:

  • AERSCREEN - a screening version of AERMOD (available as a separate BREEZE application)
  • AERSURFACE - a surface characteristics preprocessor
  • BPIPPRIME - a multi-building dimensions program that incorporates the GEP technical procedures for PRIME applications (embedded in BREEZE AERMOD)


BREEZE AERMOD enhances these basic EPA programs providing modelers with more functionality and tools for analyzing results.

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 env ::  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 val ::  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 addi ::  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 p ::  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. E ::  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 terr ::  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 ::  learn more...