CMAS: Community Modeling and Analysis System
Community Modeling and Analysis System
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CMAS
Community Modeling and Analysis System
Upcoming Training
CMAQ Online Training
: Apr 21, 2026
CMAQ Online Training
: Oct 27, 2026
SMOKE Online Training
: Oct 13, 2026
CMAS Conference
25th Annual CMAS Conference, October 19-21, 2026
Conference Web Site
Registration opens May 1, 2026
Latest Releases
VERDI 2.2
(12/2025)
SMOKE v5.2.1
(09/2025)
SMOKE v5.2
(07/2025)
All releases
Help
If you need help compiling or running one of our supported products, try the following:
Step 1
Read Model Documentation
Step 2
Search the CMAS Forum
Step 3
Take a Training
News
Air Pollution Conference Brazil - CMAS South America
To be held at the Sheraton Hotel, Vitoria, Espirito Santo, Brazil, Nov 17-19, 2026
Save the Date: The CMAS Conference is back
We are thrilled to announce that 2026 CMAS Conference is scheduled for October 19th - 21st. Join us as we celebrate the 25th anniversary of the CMAS Conference and 25 years of global modeling community support.
Mark your calendars, and stay tuned for the session topics release, call for abstracts, and registration opening. We hope to see you this fall!
Visit
for more information.
CMAS Webinar: Cloud-based Approach to Atmospheric Model Evaluation: Introducing AMET-Web
CMAS Webinar: Cloud-based Approach to Atmospheric Model Evaluation: Introducing AMET-Web
May 14, 2026 13:00 ET
Registration is required
Presenter: Liz Adams, UNC Institute for the Environment
The Atmospheric Model Evaluation Tool (
AMET
) is a publicly available and open-source software developed by the U.S. EPA to facilitate the evaluation of meteorological and air quality models. AMET itself is built using several open-source software packages including R and is dependent on MariaDB database software that is leveraged to store the paired observation and model outputs. The latest version of AMET (v1.6) provides a new web-based approach to performing model evaluation, and the CMAS Center created a public AMI containing AMETv1.6 on AWS to facilitate the use of AMET-Web for the CMAS user community. This webinar will demonstrate how to use AWS Cloud resources to create a virtual machine from the AMETv1.6 AMI with AMET pre-installed, with instructions to configure php scripts to create and visualize air quality (AQ) and meteorology (MET) model-observation plots from a web browser. The AMET database on this AMI is pre-loaded with model-observation paired data for July 2018 (aqExample for CMAQ) and July 2016 (metExamples for WRF, MPAS and MCIP). In addition, the AMI contains paired annual air quality model-observation data from the
EQUATES
: EPA's Air QUAlity TimE Series Project for 2002-2019. This webinar will provide demonstration of using AMET-Web to select the databases, projects, time ranges, species and observation networks and to visualize and interact with the resulting analysis plots for both AQ and MET projects. In addition, the cost of storage and computing resources to deploy AMETv1.6 on AWS will be discussed. The publicly available AMETv1.6 AMI combined with the quick and reproducible deployment of AMET-Web on AWS will enable additional members of the CMAS Community to adopt this for their applications.
Co-authors: Manish Soni and Sarav Arunachalam, UNC Institute for the Environment
For more information, please visit the
CMAS Webinars
page.
Register Here
Note:
We will record the webinar and post the recording to YouTube after the event.
Information for New Users
Welcome to CMAS!
We are a community of environmental and air quality modelers. If you are interested in
downloading
CMAQ, SMOKE, BenMAP, or any of our other supported models
, if you are looking for
assistance with any of our supported
models
, if you are looking for a
bibliography
of air quality modeling related published works
, or you are looking for an
atmospheric
modeling position
, you've come to the right place!
The first thing you should do is
create
a CMAS user account
. This will allow you full access to everything the site has to offer, including
model
downloads
. Once you have a CMAS account,
registering
for our annual CMAS Conference
or
model
trainings
is a snap. Even if you change your email or address, you can easily
edit
your contact information
(once you are logged in). All of your registrations and payment information can be found in your User Details on the top menu.
You can always use our search bar at the top to search within our site. You can always reach a CMAS team member with general CMAS-related questions (please no technical questions) by emailing
cmas@unc.edu
. And don't forget to read the latest issue of the
CMAS
Supported Products
BenMAP
CMAQ
CoST/EMF
C-TOOLS
FEST-C
I/O API
MCIP
R-LINE
SMOKE
SPATIAL ALLOCATOR
VERDI
BenMAP is a Windows-based computer program that estimates the health benefits from improvements in air quality.
More information
The Community Multiscale Air Quality (CMAQ) Modeling System combines current knowledge in atmospheric science and air quality modeling with multi-processor computing techniques in an open-source framework to deliver fast, technically sound estimates of ozone, particulates, toxics, and acid deposition.
Documentation
Training
EPA's CMAQ site
CoST/EMF allows users to estimate the emission reductions and costs associated with future-year control scenarios, and then to generate emission inventories with the control scenarios applied.
Documentation
More Information
C-TOOLS are a suite of web-based modeling and visualization tools for community scale modeling of local air quality.
C-LINE
C-PORT
More Information
The Fertilizer Emission Scenario Tool for CMAQ (FEST-C) system is used to simulate daily fertilizer application information using the Environmental Policy Integrated Climate (EPIC) model for a defined CMAQ domain.
Documentation
More Information
The Input/Output Applications Programming Interface, otherwise known as the I/O API, is the standard data access library for EPA's Models-3 project. The I/O API provides a variety of data structure types for organizing data, and a set of access routines which offer selective direct access to data in terms meaningful to the modeler.
Documentation
More Information
MCIP (Meteorology-Chemistry Interface Processor) is a processing program that takes in
meteorological model outputs and prepares meteorological data needed by CMAQ.
Documentation
More Information
The Research LINE-source dispersion model for near-surface releases (R-LINE) research grade dispersion model that is currently under development by EPA ORD for near-roadway assessments. R-LINE is a part of EPA ORD's ongoing evaluation of air quality impacts in the near-road environment. The research model is based upon a steady-state Gaussian formulation and is designed to simulate line type source emissions (e.g. mobile sources along roadways) by numerically integrating point source emissions.
Documentation
More Information
The Sparse Matrix Operator Kernel Emissions (SMOKE) Modeling System allows emissions data processing methods to integrate high-performance-computing (HPC) sparse-matrix algorithms. The SMOKE system is a significant addition to the available resources for decision-making about emissions controls for both urban and regional applications. It provides a mechanism for preparing specialized inputs for air quality modeling research, and it makes air quality forecasting possible.
Documentation
Training
smoke-model.org
A collection of tools designed to create spatial surrogates for meteorological and air quality modeling without using GIS software.
Documentation
More Information
VERDI is a Java program for visualizing meteorology, emissions, and air quality modeling data. With options for overlaying GIS Shapefiles and observational data onto model output, VERDI offers a range of options for viewing atmospheric modeling data. VERDI scripting provides a powerful interface for automating the production of graphics for analyzing your data.
Documentation
verdi-tool.org
Community Modeling and Analysis System (CMAS)
More About CMAS
General inquiries about the CMAS Center and questions about the web site should be directed to cmas@unc.edu