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Dispersion Models*Please click on the appropriate area below*-  **Preferred/Recommended Models****Models3****Screening Tools****Alternative Models****Related       Programs****Model Tutorials**  
 

 
**Preferred/Recommended Models**
***      *The models offered in this area are     currently listed in Appendix A of the *Guideline on Air Quality Models (*published     as Appendix W of 40 CFR Part 51).   See Appendix A of the *Guideline,* posted on the Modeling Guidance page of this website for a     summary description of these models:****BLP, CALINE3,     CALPUFF, CTDMPLUS, ISC3, and    OCD.**      
 Note: To     view and access all available Model Change Bulletins,  click    here.Note: Selected User's Guides     are available from NTIS.Note: To view Model Status,      click here.

       
***BLP  *         (*Bouyant Line and Point Source Model* )  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.**
**Code/Executable/Test         Cases/Post-processors** -- (213KB,ZIP)**User's Guide&        User's Guide Addendum****Latest          Model Change Bulletin** ***CALINE3  *          a steady-state Gaussian dispersion model designed to determine air         pollution concentrations at receptor locations downwind of "at-grade,"         "fill," "bridge," and "cut section" highways located in relatively         uncomplicated terrain.**
**Code/Executable/Test Case         --**(53KB,ZIP)**User's Guide****Latest        Model Change Bulletin** ***CALPUFF  *          a multi-layer, multi-species non-steady-state puff dispersion model that         simulates the effects of time- and space-varying meteorological         conditions on pollution transport, transformation and removal.          CALPUFF can be applied on scales of tens to hundreds of kilometers.          It includes algorithms for subgrid scale effects (such as terrain         impingement), as well as, longer range effects (such as pollutant         removal due to wet scavanging and dry deposition, chemical         transformation, and visibility effects of particulate matter         concentrations).**                                                        
                                        ********************************************************               --***Please         read the following before accessing the CALPUFF modeling system--*The files associated with this system, e.g., executables/source         code, preprocessors, associated utilities, test cases, selected         meteorological data sets and documentation can be found on Earth Tech's         website.  Support documents related to         CALPUFF can be found on this website and are listed below.  Earth Tech will provide updates and changes as necessary         for the CALPUFF modeling system on their website.  Users entering         their website will have the opportunity to register their e-mail         addresses in order to receive notices of any updates to the system.          This registration is voluntary and not necessary to access the system         files.**

**Upon entering the Earth Tech website, you will see CALPUFF         Frequently Asked Questions (FAQs) on the left-hand panel.  To         access the system code, click on "*DOWNLOAD"*, then click on Skip         Registration if you do not want to register.**

**                                            Enter EARTH         TECH exit EPA**

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                                **Support Documents***** *                  **

**There have been a number of cases in which CALPUFF has been applied,         and many of these have been published.  For a list of such articles         we know about, please         click HERE.          This list includes the following areas: Support Documents, Peer Reviews         and Literature**
**We encourage other such studies, especially:        -  those that evaluate CALPUFF         at distances beyond 200km,         - and those for which CALPUFF is applied in         complex wind situations.  We welcome the submission of such         articles and ask that they be sent to our         Webmaster (please provide         full citation and if available a PDF file for distribution).  Our intention is         to populate the list with more application articles as they become         available and as experience with CALPUFF is gained.***** ***** *****CTDMPLUS (Complex Terrain Dispersion Model Plus Algorithms for         Unstable Situations)*a refined point source         gaussian air quality model for use in all stability conditions for         complex terrain.  The model contains, in its entirety, the         technology of CTDM for stable and neutral conditions.**
**Code/Executable/Test Case         --**(842KB,ZIP)**User's Guide Supplement**--(12KB,ZIP)**User's Guide, Volume 1********User's Guide, Volume 2********User's Guide for Terrain         Preprocessor********User's Guide for Meteorological         Preprocessor********Final Report** available from **NTIS****Latest        Model Change Bulletin** ***ISC3 (Industrial Source Complex Model) *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.  This model can account for         the following: settling and dry deposition of particles; downwash;         point, area, line, and volume sources; plume rise as a function of         downwind distance; separation of point sources; and limited terrain         adjustment.  ISC3 operates in both long-term and short-term modes.**
**Code/Executable/Test Case         -- ****SHORT term**(1.7MB,ZIP)**;        LONG term**(390KB,ZIP)**User's Guide -        Volume 1 w/Addendum                               Volume 2 w/Addendum ****Latest  Model Change         Bulletin -- SHORT term/LONG         term**

**Building Profile Input         Program Preprocessor - BPIP**(91KB,ZIP)**Latest        Model         Change Bulletin** ***OCD*(*Offshore and Coastal Dispersion Model*)  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. **
**Code/Executable --**        (7.7MB,ZIP)**User's Guide**--         (408 MB,ZIP)**User's Guide Supplement****Latest        Model Change Bulletin** 
    
**Screening Tools**     
**This area     provides a list of screening tools that can be used preceeding a refined     modeling analysis.  The screening tools listed in this section are:****CAL3QHC/CAL3QHCR,    COMPLEX1, CTSCREEN,    LONGZ, RTDM3.2,     SCREEN3,****SHORTZ,    TSCREEN, VALLEY  and    VISCREEN.**

  Note:     To view and access all available Model Change Bulletins,  click    here.Note: Selected User's Guides     are available from NTIS.Note: To view Model Statue,      click here.  
***CAL3QHC/CAL3QHCR*(*CALINE3 with queuing and hot spot calculations*)          CAL3QHC is a CALINE3 based CO model 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.  		Both models are available below.**
**Executables  for CAL3QHC 		and CAL3QHCR --**        (323KB,ZIP)**User's Guide**        --(131KB,ZIP)**Latest        Model Change Bulletin** ***COMPLEX1*a multiple point source screening technique with terrain         adjustment that incorporates the plume impaction algorithm of the VALLEY         model.**
**Executable** --         (129KB,ZIP)**User's Guide** presently not         available.**Latest        Model Change Bulletin** ***CTSCREEN  *         (*Complex Terrain Screening model*)  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.**
**Readme/Executable/Test         Case & Source Code --**(710KB,ZIP)**w/Extended Memory Executable****User's Guide****Supplement to User's Guide****Report on Modifications         to CTSCREEN/CTDMPLUS ****Notes on Terrain Input         to CTDM+/CTSCREEN --** (10KB,TXT)**Latest        Model Change Bulletin** ***LONGZ *          a steady-state Gaussian plume formulation for both urban and rural areas         in flat or complex terrain to calculate long term (seasonal and/or         annual) ground-level ambient air concentrations attributable to         emissions from up to 14,000 arbitrarily placed sources (stack,         buildings, and area sources).**
**Code --**(56KB,ZIP)**User's Guide**-- available         from **NTIS**.**Latest        Model Change Bulletin** ***RTDM3.2*(*Rough Terrain Diffusion Model*) 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.**
**Executable --**        (106KB,ZIP)**User's Guide**--not         available**Latest        Model Change Bulletin** ***SCREEN3*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.**
**Readme/ Code/Executable         --**(176KB,ZIP)**User's Guide****Latest        Model Change Bulletin** ***SHORTZ*a steady-state bivariate Gaussian plume formulation for         both urban and rural areas in flat or complex terrain to calculate         ground-level ambient air concentrations.  It can calculate 1-hr,         2-hr 3-hr, etc. average concentrations due to emissions from stacks,         buildings, and area sources for up to 300 arbitrarily placed sources. **
**Code --**(56KB,ZIP)**User's Guide**--not         available**Latest        Model Change Bulletin** ***TSCREEN*(*Toxics Screening*) 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 within it,         SCREEN3, PUFF, and RVD (Relief Valve Discharge).**         
**Code/Executable/Test Case         --**(1.6MB,ZIP)**User's Guide****TSCREEN Workbooks****Latest        Model Change Bulletin*****VALLEY  *         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.**
**Code--**(76KB,ZIP)**User's Guide**--available         from **NTIS****Latest        Model Change Bulletin** ***VISCREEN*calculates the potential impact of a plume of specified         emissions for specific transport and dispersion conditions. **
**Executable --**        (121KB,ZIP)**User's Guide Update Pages         Users Guide available from NTIS****Latest        Model Change Bulletin** 
 
**Alternative Models*****(Case-by-Case)***
***Model Summary     Descriptions: *As a compliment to our preferred/recommended refined air dispersion     models in Appendix A of the Guideline on Air Quality Models, the      document, ALTMODEL.PDF,     provides a list of refined air quality models for use on a case-by-case     basis for individual regulatory applications.      This list is a replacement     for what was formerly     Appendix B of the Guideline on Air Quality Models (Appendix W     to 40 CFR Part 51) and since has been removed from the published guideline.      Note that all of the models listed in ALTMODEL.PDF are referenced in this     section.   For case-by-case justification see Section 3.2, Use of     Alternative Models, of the Guideline   for additional details.**

**This area     provides a list of models that can be used for special applications with     case-by-case justification.   The models listed in this section     are:****ADAM,     ADMS, AFTOX, ASPEN,    AVACTA, CAMx,****CDM2,****CMAQ,    DEGADIS,****EKMA,     ERT, HGSYSTEM,     HOTMAC, HYROAD, LONGZ,     MTDDIS, OZIPR,     OBODM, PAL,****Panache,    PLUVUEII, PPSP,****RAM****,     REMSAD, RPMIV, SCIPUFF,    SCSTER, SDM,     SHORTZ ,****SIMPLE LINE SOURCE,    SLAB, UAM-V,****UAM-IV**
 Note:     Selected User's Guides are available from    NTIS.   
***ADAM           (Air Force Dispersion Assessment Model)  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.**
**Executables** --         (271KB,ZIP)**Readme --**(Please read 		first) ***ADMS-3 (Atmospheric Dispersion Modeling System)*an advanced model for calculating concentrations of         pollutants emitted both continuously from point, line, volume and area         sources, or discretely from point sources.  The model includes         algorithms which take account of the following: effects of main site         buiding; complex terrrain; wet deposition, gravitational settling and         dry deposition; short term fluctuations in concentration; chemical         reactions; radioactive decay and gamma-dose; plume rise as a function of         distance; jets and directional releases; averaging time ranging from         very short to annual; condensed plume visibility; meteorological         preprocessor.**
**The modeling system is         available at no cost in selected circumstances.  Potential users         should contact Dr. David Carruthers at  "David.Carruthers@cerc.co.uk"           for information on acquiring the ADMS-3 modeling system.**

**For additional information         on the ADMS-3 Modeling System please link to the        Cambridge Environmental         Research Consultants Website--EXIT EPA*****AFTOX *         (*Air Force Toxics Model*)  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.**
**Executable/Test Case/Readme         --**(173KB,ZIP) **User's Guide**--         (26KB,ZIP) ***ASPEN*(*Assessment System for Population Exposure Nationwide*)           a Gaussian dispersion model used to estimate toxic air pollutant         concentrations over a large scale domain, such as the entire continental         U. S.****Descriptive Statement****ASPEN  User's Guide****ASPEN Modeling System         (*ftp*download)**
***EMS-HAP(Version 3.0)        (Emissions Modeling System for Hazardous Pollutants)* an         emissions processor that performs the steps needed to process an         emission inventory for input into the ASPEN model or the ISCST3 model**.  **Important Note:  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.**

**           Descriptive Statement**    **EMS-HAP Version 2 User's Guide**        (for reference only)           **EMS-HAP Version 3 User's Guide**    **EMS-HAP         Modeling System (*ftp*download)**

**                                                 The ASPEN model and the EMS-HAP Version 		3.0 emission modeling system              were used to estimate the ambient concentrations for the              National-Scale Air Toxics Assessment for 1999.  The 		results will be published              in the 		Fall of 2004 on the Air Toxics 		website.  The 		1996 results using EMS-HAP             Version 2.0, are 		still available on the National Air Toxics Assessment Activities             website.            **

**            *****AVACTA II *a Gaussian model in which atmospheric dispersion         phenomena are described by the evolution of plume elements, either         segments or puffs.  It can be applied for short (1 day) simulations         in both transport and calm conditions.  Available from Dr. Paolo         Zannetti, QEP-Principal Exponett, Inc., 149 Commonwealth Dr., P.O. Box         3015, Minlo Park, CA 94025; PH 650 688-6962.*****CAMx*(*Comprehensive Air Quality Model with Extensions*)****            Infrormation related to this model can be found on the 7th Modeling         Conference****              web page under Notice of Proposed Rule         Making.*****CDM2*(*Climatological Dispersion Model*)  a         climatological steady-state Gaussian plume model for determining         long-term (seasonal or annual) arithemetic average pollutant         concentrations at any ground-level receptor in an urban area.**
**Code/Executable/Test Case         --**(76KB,ZIP)**User's Guide****Latest        Model Change Bulletin** ***CMAQ*(*Community Modeling Air Quality*) a multiscale,         one atmosphere model which is designed to assist the environmental         management community's ability to evaluate the impact of air quality         management practices for multiple pollutants at multiple scales and         equip the scientist's ability to better understand, and simulate         chemical and physical interactions in the atmosphere; available from the        Models-3 website.*****DEGADIS*(*Dense Gas Dispersion Model) *simulates the         atmospheric dispersion at ground-level, 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.**
**Code/Executable --**        (933KB,ZIP)**User's Guide  &         Technical Document**        --**Latest        Model Change Bulletin*****EKMA*an empirical, city-specific model which is used to fill         the gap between more sophisticated photochemical dispersion models and         proportional (rollback) modeling techniques.**
**Code/Executable/Test         Case,Input Generator &****Trajectory Model --**        (468KB,ZIP)**User's Guide,        Volume 1 &        Volume 2****Procedures for         applying City-Specific EKMA****Latest        Model Change Bulletin****User's Guide for the        EKMA Input Generator         (OZIPM-4) *****ERT*          (*Visibility Model*)  a Gaussian dispersion model designed to         estimate visibility impairment for arbitrary lines of sight due to         isolated point source emissions by simulating gas-to-particle         conversion, dry deposition, NO to NO2 conversion and linear radiative         transfer.  Available from NTIS, Order Number PB96-501978, doc.         PB96-171855..*****HGSYSTEM  *         a collection of computer programs designed to predict the source-term         and subsequent dispersion of accidental chemical releases with an         emphasis on denser-than-air (dense gas) behavior.  Available from         NTIS, Order Number PB96-501960.*****HOTMAC/RAPTAD*HOTMAC is a 3-dimensional Eulerian model for weather         forecasting; RAPTAD is a 3-dimensional Lagrangian random puff model for         pollutant transport and diffusion.  These models are used for         prediction of transport and diffusion processes for complex terrain, 		coastal regions, urban areas, and around buildings         where conventional models fail.  Available from YSA Corporation,         (505) 989-7351. See www.ysasoft.com.*****HYROAD*HYROAD (HYbrid ROADway Model) integrates three historically 		individual modules that simulate the effects of traffic, emissions and 		dispersion.  The traffic module is a microscale transportation 		model which simulates individual vehicle movement.  The emission 		module uses speed distributions from the traffic module to determine 		composite emission factors; spatial and temporal distribution of 		emissions is based on the vehicle operation simulations.  The model 		tracks vehicle speed and acceleration distributions by signal phase per 		10-meter roadway segment for use in both emissions distribution and for 		induced flows and turbulence.  The dispersion module uses a Lagrangian puff formulation, along with a gridded non-uniform wind and 		stability field derived from traffic module outputs, to describe 		near-roadway dispersion characteristics.  HYROAD is designed to 		determine hourly concentrations of carbon monoxide (CO) or other 		gas-phase pollutants, particulate matter (PM) and air toxics - in 		consultation with appropriate Reviewing Authority -  from vehicle emissions at receptor locations that 		occur within 500 meters of the roadway intersections.Executable, Test Case, README 		(13.5 MB, ZIP)Model Formulation -- 		(1.8KB, ZIP)User's Guide -- (1KB, ZIP)*****LONGZ****** *Information         on this model can be found on the Dispersion Models****   web page under        Screening Tools.*****MTDDIS*          (*Mesoscale Transport Diffusion and Deposition Model for Industrial         Sources*)   a variable-trajectory Gaussian puff model         applicable to long-range transport at point source emissions over level         or rolling terrain.  It can be used to determine 3-hour maximum and         24-hour average concentrations of relatively nonreactive pollutants from         up to 10 separate stacks.  Available from Dr. I.T. Wang, Combustion         Engineering, Environmental Monitoring and Services , Inc. 2421 West         Hillcrest Drive, Newburn Park, CA 19320.*****OBODM (Open Burn/Open Detonation Model)  i*ntended         for use in evaluating the potential air quality impacts of the open         burning and detonation (OB/OD) of obsolete munitions and solid         propellants.  OBODM uses cloud/plume rise dispersion, and         deposition algorithms taken from existing models for instantaneous and         quasi-continuous sources to predict the downwind transport and         dispersion of pollutants released by OB/OD operations.**
**Executable/Test Case         --**(7/31/03)(380KB,ZIP) **Source Code --**        (602KB,ZIP)**README**(errata by         dates)**User's Guide -        Volume 1         , Volume 2****OZIPR (A one-dimensional photochemical box model)  an         alternative version of the OZIP model (see EKMA)         that deals with air toxic pollutants.****Code/Executable/Test         Inputs --**(907KB,ZIP)**README**(first)**User's GuideAddendum         to the User's Guide ****Supporting         Report also         available from**NTIS;          Appendices :         A,        B,        C,        D,        E,        F**   (A Simplified Approach for Estimating Secondary Production of         Hazardous Air     Pollutants (HAPS) Using the OZIPR Model, EPA-454/R-99-054.)***PAL-DS(Point,         Area, Line Source Algorithm with Deposition and Sedimentation)*a method of estimating short-term dispersion using         Gaussian-plume steady-state assumptions.  The model can treat         deposition of both gaseous and suspended particulate pollutants  in         the plume since gravitational settling and dry deposition of the         particles are explicitly accounted for.  Available from NTIS, Order         Number PB90-500802.*****Panache*an Eulerian (and Lagrangian for particulate matter),         3-dimensionl finite volume fluid mechanics code designed to simulate         continuous and short-term pollutant dispersion in the atmosphere, in         simple or complex terrain.  Available from Transoft US. Inc., 818         Reedy Creek Rd., Cary, NC 27513-3307. Phone 919 380-7500.*****PLUVUEII*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. **
**Code/Executable/Test Case         --**(782KB,ZIP)**User's Guide**        --(40KB,ZIP)**Latest        Model Change Bulletin*****PPSP*          (*Maryland Power Plant Siting Model*)  a Gaussian dispersion         model applicable to tall stacks in either rural or urban areas, but in         terrain that is essentially flat (on a scale large compared to the         ground roughness elements).  Available from Power Plant Siting         Program,  Department of Natural Resources, Tawes State Office         Building,  Annapolis, MD 21401,  Attn: Dr. Michael         Hirschfield.*****RAM*(*Gaussian-Plume Multiple Source Air Quality Algorithm*)          a steady-state Gaussian plume model for estimating concentrations of         relatively stable pollutants, for averaging times from an hour to a day,         from point and area sources in a rural or urban setting.  Level         terrain is assumed.**
**Code/Executable/Test Case         --**(144KB,ZIP)**User's Guide****Latest        Model Change Bulletin** ***REMSAD*(*Regulatory Modeling System for Aerosols and         Deposition*)  a three dimensional grid-based Eulerian air         quality model.  REMSAD simulates concentrations and deposition of         atmospheric pollutants over large spatial scales (i.e. contiguous US).          Air pollution issues meant to be addressed by REMSAD include PM2.5,         Regional Haze, and toxic, nitrogen, and acid deposition.  REMSAD         provides spatially and temporally resolved air concentration, visibility         and deposition values.  Recent improvements to the modeling sysytem         include expanded treatment of mercury chemistry. **
**For information on how to         acquire the latest available version, 7.03, of REMSAD please link to the         ICF Consulting/Systems Applications International's        REMSAD website.           -- EXIT EPA *****RPM-IV*(*Reactive Plume Model*) **a model used for         estimating short-term concentrations of primary and secondary pollutants         resulting from point or area source emissions.  The model is         capable of simulating the complex interaction of plume dispersion and         non-linear photochemistry.  Two main features of the model are: (1)         the horizontal resolution within the plume, which offers a more         realistic treatment of the entrainment process and (2) its flexibility         with regard to choices of chemical kinetic mechanisms.**
**Code/Executable/Test Case         --**(76KB,ZIP)**User's Guide**        --(406KB,ZIP)**Latest        Model Change Bulletin*****SCIPUFF*          Second-order Closure Integrated PUFF Model****    Information         related to this model can be found on the 7th Modeling conference****     web         page under Notice of Proposed rule         Making.*****SCSTER*(*Multisource Model*)  a modified version of         the CRSTER model.  The primary distinctions of SCSTER are its         capability to consider multiple sources that are not necessarily         collocated, its enhanced receptor specifications, it variable plume         height terrain adjustment procedures and plume distortion from         directional wind shear.  Available from Bryan Baldwin,          Research Program Supervisor, Air Quality Program,  Southern Company         Services, Post Office Box 2625,  Birmingham, AL 35202.*****SDM*(*Shoreline Dispersion Model*)  a         multiple-point Gaussian dispersion model that can be used to determine         ground level concentrations from tall stationary point source emissions         near a shoreline.**
**Code/Executable/Test Case         --**(328KB,ZIP)**Latest        Model Change Bulletin*****SHORTZ*Information related to this model can be found on the         Dispersion Models  web page under        Screening Models.*****Simple Line Source         Model * A simple steady- state Gaussian plume         model which can be used to determine hourly (or half-hourly) averages of         exhaust concentrations within 100m from a roadway on a relatively flat         terrain.  Available from Dr. D.P. Chock, Environmental Science         Department, General Motors Research Laboratories, General Motors         Technical Center, Warren, MI 48090.*****SLAB*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.**
**Code/Executable/Test Case         --**(111KB,ZIP)***UAM-V*(        *The UAM-V Photochemical Modeling System* )   The Urban         Airshed Model (UAM-V) is a three dimensional photochemical grid model         that calculates concentrations of pollutants by simulating the physical         and chemical processes in the atmosphere.   The updated         version of the UAM-V modeling system (version 1.3) includes         process-analysis capabilities, an enhanced chemical mechanism (enhanced         treatment of hydrocarbon and toxic species), updated deposition and         nested-grid algorithms, a flexible coordinate system (including Lambert         conformal), and user-selection of a "standard" or "fast" solver.**
**The updated version 1.30         and the earlier version 1.24 (OTAG version) are available from the         developer Systems Applications International (SAI) for general use and         at no cost to interested users.  To obtain a copy of the UAM-V         modeling system, potential users should contact Sharon Douglas (SDouglas@icfconsulting.com)         for information concerning registration and acquisition of the system.          Potential users are encouraged to register with SAI to receive         information on updates to the code, training workshops, and available         databases.**

**For additional information         on the UAM-V modeling system please link to the SAI        UAM-V website -- EXIT         EPA.*****UAM-IV*(*Urban Airshed Model IV*)  an urban scale,         three dimensional, grid type numerical simulation model.  The model         incorporates a condensed photochemical kinetics mechanism for urban         atmospheres.   UAM-IV  is designed for computing ozone         (O3) concentrations under short-term, episodic conditions lasting one or         two days resulting from emissions of oxides of nitrogen (NOx), volatile         organic compounds (VOC), and carbon monoxide (CO).  The model         treats VOC emissions as their carbon-bond surrogates.**
**README  --**        Please read before downloading the UAM-IV system.**Code/Executable/Test Case --**(5.5MB,ZIP)**User's Guides/Information**--(232KB,ZIP)**Latest        Model Change Bulletin** 
    

    
**Related Programs**
   **This area     provides a list of programs and utilities that are used in support of some     of our dispersion models, especially those listed under     preferred/recommended.  Note that utilities that are designed for use     with particular models will be found with those models.  The programs     listed in this section are:****BPIP,     CALMPRO, CHAVG  and CONCOR.**

    Note: To access and view all     available Model Change Bulletins, click here.Note: Selected User's Guides     are available from NTIS.
***BPIP  *         (*Building Profile Input Program*)*-*a PC-based program         designed to incorporate the concepts and procedures expressed in the         Good Engineering Practice (GEP) technical support document, building         downwash guidance, and other related references that correctly calculate         building heights (bh) and projected building widths (pbw) for simple,         multi-tiered, and groups of structures.**  		***This most recent version of BPIP, 4/21/04, has been upgraded with 		allocatable arrays while maintaining the basic functionality of the 		program.***
**Code/Executable/Test Case**--         (276KB,ZIP)**README**(1K,TXT)**User's Guide****User's Guide Updates****Latest        Model Change Bulletin** ***CALMPRO  *         (*Calms Processor*) **a meteorological processor which         provides consistent application of handling calms by setting the wind         direction of the calm hour to the last reported wind direction and the         wind speed to 1 m/s.**
**Code/Test Case/Readme**         -- (12KB,ZIP)**Latest        Model Change Bulletin** ***CHAVG *          a post-processor program for computing running averages (averages that         begin each hour and overlap) and end-to-end averages (averages that do         not overlap) from hourly concentrations files.**
**Code/Test Case/Readme         --**(32KB,ZIP)**Latest        Model Change Bulletin** ***CONCOR*a program for converting latitude/longitude coordinates         to UTM or UTM coordinates to latitude/longitude.**
**Code/Executable/Test Case/Readme         --**(31KB,ZIP)**Latest        Model Change Bulletin** 
  

   
**Model     Tutorials**   
**This area     provides the following model tutorials::****CTSCREEN,    ISC2, SCREEN,    TSCREEN, and    VISCREEN.**      

        
***CTSCREEN Tutorial *****CTSCREEN Demonstration         --**(420K,ZIP)**CTSCREEN Model, File 1         --**(305K,ZIP)**CTSCREEN Model, File 2         -- (**329K,ZIP)**Text editor file --**        (48K,ZIP)**Terrain data file --**(77K,ZIP)**BUCKBERG          Terrain data file --**(3K,TXT)**ORIG Terrain         data file --**(3K,TXT)**CTDM Batch         file --**(23,TXT)**Tutorial Documentation**WP5.1-- (155K,ZIP)**Instructions         for CTSCREEN Tutorial --**(3K,TXT)***ISC2 Tutorial *****ISCST2/ISCLT2 Demonstration         --**(822K,ZIP)**ISCST2 Model  --**(654K,ZIP)**ISCEV2 Model  --**(109K,ZIP)**ISCLT2 Model           --**(133K,ZIP)**Tutorial Documentation**WP5.1.--  (206K,ZIP)**Instructions         for ISC2 Tutorial  --**(2K,TXT)***SCREEN Tutorial *****SCREEN Demonstration**         -- (445KB,ZIP)**SCREEN Model  --**(129K, ZIP)**Tutorial Demonstration          --**(46K, ZIP)**Instructions for SCREEN         Tutorial --**(2K,TXT)***TSCREEN Tutorial *****TSCREEN Demonstration         --**(579K,ZIP)**TSCREEN Model, File 1         --**(253K,ZIP)**TSCREEN Model, File 2         --**(382K,ZIP)**TSCREEN Model, File 3         -- (**568K,ZIP)**Tutorial Documentation**Wpf 5.1 -- (86K,ZIP)**Instructions         for TSCREEN Tutorial  --**(2K,TXT)***VISCREEN Tutorial *****VISCREEN Demonstration.         --**(1058K,ZIP)**VISCREEN Model --**(71K,ZIP)**Tutorial Documentation         --**WP5.1 -- (486K,ZIP)**Instructions         for VISCREEN Tutorial  --**(2K,TXT)
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