Following is a list of freeware that provides tools for modeling the fate and distribution of contaminants in the atmosphere. Before you access any software or apps, please read our disclaimer and permissions page if you haven't already done so.

ADAM
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Air Force Dispersion Assessment Model (ADAM) is a modified box and Gaussian dispersion model which incorporates thermodynamics, chemistry, heat transfer, aerosol loading, and dense gas effects. Release scenarios include continuous and instantaneous, area and point, pressurized and unpressurized, and liquid/vapor/two-phased options.

AERMAP
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A terrain preprocessor for AERMOD. AERMAP processes commercially available Digital Elevation Data and creates a file suitable for use within an AERMOD control file. This file would contain elevation and hill-height scaling factors for each receptor in the air dispersion study.

AERMOD Modeling System
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A steady-state plume model that 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.

AFTOX
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A Gaussian dispersion model that will handle continuous or instantaneous liquid or gas elevated or surface releases from point or area sources. Output consists of concentration contour plots, concentration at a specified location, and maximum concentration at a given elevation and time.

AP-42: Compilation of Air Pollutant Emission Factors (Mobile Sources)
By US Environmental Protection Agency, Office of Mobile Sources. "Compilation of Air Pollutant Emission Factors, Volume II: Mobile Sources" (commonly referred to as "AP-42") has two sections, I - Highway Vehicles and II - Nonroad Mobile Sources. Section I provides extensive information about the highway vehicle emission factor model, currently MOBILE5, and includes numerous tables of both values used in the model and "look-up tables" of emission factors produced by the model. Section II provides emission factor information, in the form of look-up tables, for a wide range of nonroad mobile sources (including agricultural equipment, construction equipment, lawn and garden equipment, aircraft and aircraft engines, locomotives, marine vessels, and miscellaneous types of equipment).

ASPEN
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). The Assessment System for Population Exposure Nationwide (ASPEN) consists of a dispersion and a mapping module. The dispersion module is a Gaussian formulation based on ISCST3 for estimating ambient annual average concentrations at a set of fixed receptors within the vicinity of the emission source. The mapping module produces a concentration at each census tract. Input data needed are emissions data, meteorological data and census tract data.

BLP
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A Gaussian plume dispersion model designed to handle unique modeling problems associated with aluminum reduction plants, and other industrial sources where plume rise and downwash effects from stationary line sources are important.

BlueSky
By US Department of Agriculture, Forest Service. A modeling framework designed to predict cumulative impacts of smoke from forest, agricultural, and range fires. The BlueSky smoke modeling framework combines emissions, meteorology, and dispersion models to generate predictions of smoke impacts across the landscape.

CAL3QHC/CAL3QHCR
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). CAL3QHC is a CALINE3 based CO model with queuing and hot spot calculations and with a traffic model to calculate delays and queues that occur at signalized intersections; CAL3QHCR is a more refined version based on CAL3QHC that requires local meteorological data.

CALINE3
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A steady-state Gaussian dispersion model designed to determine air pollution concentrations at receptor locations downwind of highways located in relatively uncomplicated terrain. CALINE3 is incorporated into the more refined CAL3QHC and CAL3QHCR models.

CALINE4 (California LINE Source Dispersion Model)
By California Department of Transportation. 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

CALPUFF Modeling System
By Earth Tech Inc.. CALPUFF is a non-steady-state meteorological and air quality modeling system for assessing long range transport of pollutants and their impacts and on a case-by-case basis for certain near-field applications involving complex meteorological conditions. The modeling system consists of three main components and a set of preprocessing and postprocessing programs. The main components of the modeling system are CALMET (a diagnostic 3-dimensional meteorological model), CALPUFF (an air quality dispersion model), and CALPOST (a postprocessing package).

CAMEO
By US Environmental Protection Agency and National Oceanic and Atmospheric Administration. CAMEO (Computer-Aided Management of Emergency Operations) is a software suite of applications that includes: CAMEO, ALOHA, and MARPLOT. It supports government and industry chemical emergency management with chemical safety and emergency response data, digitized mapping, and air dispersion modeling.

COMPLEX1
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). COMPLEX1 is a multiple point source screening technique with terrain adjustment that incorporates the plume impaction algorithm of the VALLEY model.

CONSUME
By US Department of Agriculture, Forest Service. Input fuel characteristics, lighting patterns, fuel conditions, and meteorological attributes, then CONSUME outputs fuel consumption and emissions by combustion phase. CONSUME is designed to import data directly from the Fuel Characteristic Classification System (FCCS), and the output is formatted to feed other models and provide usable outputs for burn plan preparation and smoke management requirements.

CTDMPLUS
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Complex Terrain Dispersion Model Plus Algorithms for Unstable Situations (CTDMPLUS) is a refined point source gaussian air quality model for use in all stability conditions for complex terrain.

CTSCREEN
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A Gaussian plume dispersion model designed as a screening technique for regulatory application to plume impaction assessments in complex terrain. CTSCREEN is a screening version of the CTDMPLUS model.

DEGADIS
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Simulates the atmospheric dispersion at ground-level of area source dense gas (or aerosol) clouds released with zero momentum into the atmospheric boundary layer over flat, level terrain. The model describes the dispersion processes which accompany the ensuing gravity-driven flow and entrainment of the gas into the boundary layer.

EMS-HAP
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). The Emissions Modeling System for Hazardous Pollutants (EMS-HAP) is an emissions processor that performs the steps needed to process an emission inventory for input into the ASPEN model or the ISCST3 model. EMS-HAP is written in the SAS programming language and is designed to run on any UNIX workstation. The user will need a SAS license and some knowledge of SAS to use this program.

Emsoft Exposure Model for Soil-Organic Fate and Transport
By US Environmental Protection Agency, National Center for Environmental Assessment (NCEA). A screening model that may be used 1) to determine concentrations of contaminants remaining in the soil over a given time (when the initial soil concentration is known); 2) to quantify the mass flux (rate of transfer) of contaminants into the atmosphere over time; and 3) to subsequently calculate contaminant air concentrations by inputting mass flux values into atmospheric dispersion models.

HYROAD
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). The HYbrid ROADway Model (HYROAD) integrates three modules that simulate the effects of traffic, emissions and dispersion. It is designed to determine hourly concentrations of carbon monoxide (CO) or other gas-phase pollutants, particulate matter (PM) and air toxics from vehicle emissions at receptor locations that occur within 500 meters of the roadway intersections.

HYSPLIT
By National Oceanic and Atmospheric Administration, Air Resources Laboratory. The HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectory) model is a new version of a complete system for computing simple air parcel trajectories to complex dispersion and deposition simulations. As a result of a joint effort between NOAA and Australia's Bureau of Meteorology, the model has recently been upgraded. New features include improved advection algorithms, updated stability and dispersion equations, a new graphical user interface, and the option to include modules for chemical transformations. Without the additional dispersion modules, Hysplit computes the advection of a single pollutant particle, or simply its trajectory. Training materials on HYSPLIT and dispersion modeling are also available.

Industrial Waste Air Model (IWAIR)
By US Environmental Protection Agency, Office of Solid Waste. Evaluates inhalation risk and estimates whether specific wastes and management practices may pose an unacceptable risk to human health.

Internet Geographical Exposure Modeling System (IGEMS)
By US Environmental Protection Agency, Office of Pollution Prevention and Toxics (OPPT). IGEMS is a modernization of OPPT's older Graphical Exposure Modeling System and PCGEMS tools. IGEMS brings together in one system several EPA environmental fate and transport models and some of the environmental data needed to run them. IGEMS includes models and data for ambient air, surface water, soil, and ground water, and makes the models much easier to use than their stand-alone counterparts. IGEMS will have graphics and Geographical Information System (GIS) capabilities for displaying environmental modeling results.

ISC-PRIME
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A model with building downwash incorporated into the Industrial Source Complex Short Term Model (ISCST3).

ISC3 Long Term
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A steady-state Gaussian plume model which can be used to assess pollutant concentrations from a wide variety of sources associated with an industrial complex.

ISC3 Short Term
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A steady-state Gaussian plume model which can be used to assess pollutant concentrations from a wide variety of sources associated with an industrial complex.

MMSOILS (for DOS)
By US Environmental Protection Agency, Center for Exposure Assessment Modeling (CEAM). The Multimedia Contaminant Fate, Transport, and Exposure Model (MMSOILS) estimates the human exposure and health risk associated with releases of contamination from hazardous waste sites. The methodology consists of a multimedia model that addresses the transport of a chemical in groundwater, surface water, soil erosion, the atmosphere, and accumulation in the foodchain. The human exposure pathways considered in the methodology include: soil ingestion, air inhalation of volatiles and particulates, dermal contact, ingestion of drinking water, consumption of fish, consumption of plants grown in contaminated soil, and consumption of animals grazing on contaminated pasture.

MOBILE5.0a_h
By US Environmental Protection Agency, Office of Mobile Sources. Models highway mobile source emissions

MOBILE5b
By US Environmental Protection Agency, Office of Mobile Sources. Models highway mobile source emissions; includes the effect of the final reformulated gasoline (RFG) rules on Nox emissions

Mobile6
By US Environmental Protection Agency. Vehicle emission modeling software, to help determine the relative contribution of transportation sources to air quality.

Nonroad Vehicle and Engine Emission Modeling
By US Environmental Protection Agency, Office of Mobile Sources. Models nonroad vehicle and engine emissions; large file intended for professional mobile source emission modelers, such as state air quality officials and consultants.

Nonroad Vehicle and Engine Emission Modeling for Tier 2 Proposed Rule
By US Environmental Protection Agency, Office of Mobile Sources. Models emissions from nonroad vehicles; draft model for Tier 2 Proposed Rule

OBODM
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Intended for use in evaluating the potential air quality impacts of the open burning and detonation (OB/OD) of obsolete munitions and solid propellants.

OCD
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Offshore and Coastal Dispersion Model (OCD) is a straight line Gaussian model developed to determine the impact of offshore emissions from point, area or line sources on the air quality of coastal regions. OCD incorporates overwater plume transport and dispersion as well as changes that occur as the plume crosses the shoreline. Hourly meteorological data are needed from both offshore and onshore locations.

OZIPR
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A one-dimensional photochemical box model that is an alternative version of the OZIP model that deals with air toxic pollutants.

PART5 (Highway Vehicle Particulate Emission Modeling Software)
By US Environmental Protection Agency, Office of Mobile Sources. Particulate emission factor model

Percent View
By Lakes Environmental Software. A utility that generates the percentile concentrations for the results of the air model ISCST3.

PLUVUEII
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A model used for estimating visual range reduction and atmospheric discoloration caused by plumes resulting from the emissions of particles, nitrogen oxides, and sulfur oxides from a single source. The model predicts the transport, dispersion, chemical reactions, optical effects and surface deposition of point or area source emissions.

RTDM3.2
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Rough Terrain Diffusion Model (RTDM3.2) is a sequential Gaussian plume model designed to estimate ground-level concentrations in rough (or flat) terrain in the vicinity of one or more co-located point sources.

Screen View
By Lakes Environmental Software. A user friendly interface for the U.S. EPA screening model, SCREEN3. This US EPA approved model can be used to calculate conservative or worst-case estimates of ground level concentrations for a single source. Screen View can model scenarios with simple or complex terrain, with or without building downwash and give results at discrete or automated distances.

SCREEN3
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A single source Gaussian plume model which provides maximum ground-level concentrations for point, area, flare, and volume sources, as well as concentrations in the cavity zone, and concentrations due to inversion break-up and shoreline fumigation. SCREEN3 is a screening version of the ISC3 model.

SDM
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Shoreline Dispersion Model (SDM) is a multiple-point Gaussian dispersion model that can be used to determine ground level concentrations from tall stationary point source emissions near a shoreline.

SLAB
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). The SLAB model treats denser-than-air releases by solving the one-dimensional equations of momentum, conservation of mass, species, and energy, and the equation of state. SLAB handles release scenarios including ground level and elevated jets, liquid pool evaporation, and instantaneous volume sources.

TSCREEN
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Toxics Screening Model (TSCREEN) is a Gaussian model that implements the procedures to correctly analyze toxic emissions and their subsequent dispersion from one of many different types of possible releases for superfund sites. It contains 3 models: SCREEN3, PUFF, and RVD (Relief Valve Discharge).

VALLEY
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). A steady-state, complex terrain, univariate Gaussian plume dispersion algorithm designed for estimating either 24-hour or annual concentrations resulting from emissions from up to 50 (total) point and area sources.

VISCREEN
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). Calculates the potential impact of a plume of specified emissions for specific transport and dispersion conditions.

Can't find what you need?

Our Sponsors:

EHSsoftserve.com



EHSsoftserve.com


EHSsoftwarenews.com


HealthcareFreeware.com


Click here to learn how you can sponsor EHSfreeware





Copyright 1999-2014 by Donley Technology
This page last updated on 6/19/14