Community Modeling and Analysis System

CMAS Webinars

The CMAS Center hosts regular webinars about important air quality-related topics as a way to keep the CMAS community up-to-date and informed. Webinar topics will range from introductions of new model releases to best practices to advanced modeling techniques. All seminars will be free and open to the public and will feature a 20-30 minute presentation followed by a question and answer session.

How to Connect

CMAS webinars will use the Cisco WebEx platform. If you have not connected to a WebEx on your browser before, you will need to install a plugin when you connect. If you'd like to test your system prior to the start of the webinar, visit the WebEx Test Meeting to view system requirements and get set up.

If you are getting set up as the meeting starts, after you start the WebEx client, you may be asked for the event number. The event number is listed for each event. Or, you can return to this page and click the Join button again.

Linux users: WebEx claims it supports any Linux distribution with some minimum requirements. However, some Linux users have reported audio problems. We recommend doing a Google search and following some of the suggestions provided prior to joining the webinar.

Have A Webinar Topic?

If you'd like to suggest a topic for a webinar, or if you would be willing to give a webinar presentation on a topic that would be of general interest to the CMAS community, please contact CMAS by email at



  • October 1, 2019. 2:00 PM (Eastern):

    Presenting the CMAQv5.3 Release


  • July 27, 2017. 2:00 PM (Eastern): [Download Slides]

    Event Number: 641 164 413

    Updates in the Atmospheric Model Evaluation Tool (AMET) version 1.3

    The Atmospheric Model Evaluation Tool (AMET) (Appel et al., 2011) is a suite of software designed to facilitate the analysis and evaluation of meteorological and air quality models. AMET matches the model output for particular locations to the corresponding observed values from one or more networks of monitors. These pairings of values (model and observation) are then used to statistically and graphically analyze the model's performance.

    A new version of AMET (version 1.3) was released in July 2017. A number of updates have been made in version 1.3 from the previous version (1.2). One major update in AMETv1.3 is the replacement of the perl code with R code, which simplifies the installation of AMET as it no longer requires users to install perl and the previously required perl packages. The database setup and creation has also been simplified, with the number of required input files reduced. The MySQL credential management has been made more robust to handle password control, while the speed of the MySQL data loading has also been improved. On the AQ side of AMET, support for the AMON and FLUXNET networks has been added to AMETv1.3, along with additional analysis scripts and query options. A batch analysis script has also been added which creates pre-defined plots using a single script, eliminating the need for a user to modify and run the individual analysis scripts. A number of updates have been made to MET side of AMET, including support for MPAS data, direct read of MADIS obs files, better automatic retrieval of MADIS observations using FTP, as well as many other updates.

    This webinar will present an overview of AMET and the updates in AMETv1.3, and provide brief tutorials on the AQ and MET projects in AMET.
  • May 25, 2017. 2:00 PM (Eastern): [Download Slides | Watch Recording]

    Event Number: 640 171 919

    An Introduction to C-TOOLS 4.0

    Presenter: Sarav Arunachalam

    C-TOOLS is a series of community tools to study local air quality due to various sources. C-TOOLS are being developed by the UNC-IE in collaboration with the U.S. EPA. Current members of C-TOOLS are C-LINE and C-PORT. Each community tool is a modeling and visualization system that accesses inputs, performs calculations, visualizes results, provides options to manipulate input variables, and performs basic data analysis - all through an easy-to-use web-based interface. The community tools based upon existing algorithms for dispersion are intended to inform the community user of local air quality due to various source types in their region of interest using a reduced-form modeling approach.

    Topics to be covered include:

    • Latest version of C-LINE and C-PORT - current members of C-TOOLS
    • Overview of new features and ongoing development
    • Preview of new members that will be added in the near future

  • April 27, 2017. 2:00 PM (Eastern): [Download Slides | Watch Recording]

    Event Number: 648 624 623

    The Spatial Allocator 4.3, Release and Recent Updates

    Presenter: Zac Adelman

    The Spatial Allocator (SA) is a set of open-source tools that helps users manipulate and generate data files related to emissions and air quality modeling. The tools perform functions similar to Geographic Information Systems (GIS), but are provided to the modeling community free of charge. In addition, the tools are designed to support some of the unique aspects of the file formats used for Community Multiscale Air Quality (CMAQ), Sparse Matrix Operator Kernel Emissions (SMOKE), and Weather Research and Forecasting (WRF) modeling.

    The Spatial Allocator version 4.3 was release in January. This webinar will present the updates to the software. Topics to be covered include:

    • Tools for preparing satellite data of land use and atmospheric observations for use in meteorology and air quality modeling.
    • Updates to the Surrogate Tool for generating emissions spatial surrogates
    • The new BELD4SMK tool for converting BELD4 land cover data for estimating biogenic emissions with SMOKE
    • Model release process and the new Spatial Allocator GitHub page

  • March 30, 2017. 2:00 PM (Eastern): [Download Slides | Watch Recording]

    Presenting the CMAQv5.2 Release

    Presenters: Jon Pleim, Rohit Mathur, Wyat Appel, Ben Murphy

    EPA's Office of Research and Development, Computational Exposure Division will present the recent scientific and computational updates made by EPA to the Community Multi-Scale Air Quality Model (CMAQ). Topics to be covered include:

    • Improvements to model process representation
      • Meteorology and connections to chemistry-transport calculations (land surface modeling, lightning assimilation)
      • Enabling consistent urban to hemispheric scale modeling
      • New chemical mechanisms and updates
      • Particulate matter composition and important emission sources
    • Evaluation of model updates
    • Ongoing research and development
    • Model release process and the new CMAQ website

  • February 23, 2017. 2:00 PM (Eastern): [Download Slides | Watch Recording]

    Latest SMOKE updates and more

    Presenter: B.H. Baek, UNC Institute for the Environment

    In cooperation with the U.S. EPA, the Lake Michigan Air Directors Consortium (LADCO), and Korea National Institute of Environment and Research (NIER), and the California Air Resource Board (CARB), the UNC Institute for the Environment have been updating the Sparse Matrix Operator Kernel Emissions (SMOKE) system to enhance the quality of emissions modeling input to air quality models. Major new features in recent SMOKE include:

    • Capabilities to process gridded global emission inventories to support global and hemispheric air quality modeling
    • SMOKE4AERMOD tool development to generate AERMOD ready input files based on the U.S. EPA's National Emission Inventory (NEI)
    • Simulating real-time transponder data based emissions from Commercial Marine Vessels in the Great Lake
    • Parameterizing MOVES emissions factors lookup tables
    • Support for CARB inventory data formats and 6) various updates to support recent versions of US EPA NEI