Community Modeling and Analysis System

Job Postings

CMAS offers a place to post jobs related to atmospheric science, atmospheric modeling, meteorological modeling, and climate modeling. If you would like to post a job here, please email the job information to Make sure that you include an expiration date in your job description. If the position is hiring until filled, we will post it for 2 months, and you can ask to repost if needed.

Available Positions

  • Mobile Source Emissions Specialist with TCEQ   [APPLY]

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  • EPA Internship: Simulating Atmospheric Transformations of Airborne Pollutants   [APPLY]

    EPA Office/Lab and Location: A research opportunity is available at the Environmental Protection Agency (EPA), Office of Research and Development (ORD), Center for Environmental Measurement and Modeling (CEMM), Atmospheric and Environmental Systems Modeling Division (AESMD) located in Research Triangle Park, North Carolina.

    EPA's Office of Research and Development is focused on enhancing air quality modeling approaches to inform regulatory decisions for permitting and characterization stationary sources, specific attention to near-source air quality modeling capabilities.

    Research Project: Anthropogenic activity releases chemicals into the air that can directly affect human health or react and transform into secondary products with health impacts. EPA develops tools in support of clean air and chemical safety regulation to mitigate human health impacts of emissions to air. This project will seek to improve the representation of the lifecycle of organic and inorganic compounds from release into the atmosphere, through chemical and physical processing, to removal by deposition in models such as the Community Multiscale Air Quality (CMAQ) model ( The project will focus on the representation of atmospheric chemistry in the chemical mechanism. A chemical mechanism uses surrogate compounds to parameterize the full complexity of tropospheric chemistry. Mechanisms are expected to perform well in predicting ozone and fine particles under a variety of conditions including urban and remote, near surface and free troposphere, and winter and summer. Mechanisms were traditionally designed to capture ozone formation and species of emerging concern or important for secondary organic aerosol (SOA) are often neglected or treated in a way that is disconnected from the gas phase. Updated mechanisms are needed. As a result, EPA is leading development of a new chemical mechanism, the Community Regional Atmospheric Chemistry Multiphase Mechanism (CRACMM, Fact sheet available:

    Learning Objectives: The research participant may develop scientific hypotheses and perform data analysis to investigate how emissions as well as their oxidation products evolve in the atmosphere. This project has the potential to inform chemical transport model methodologies and/or to identify priority areas for development of mechanisms. The research participant will learn how information flows from emission inventories through chemical mechanisms to policy analysis. The research participant will collaborate with a team of internal and external researchers and balance detail and computational efficiency in algorithm development. The research participant may be involved in the following research activities:
    • Determination of chemical reaction products via literature survey or data analysis
    • Box modeling (e.g., with F0AM)
    • Emission inventory analysis
    • Regional chemical transport modeling with CMAQ
    • Interpretation of field and laboratory data
    Mentor(s): The mentor(s) for this opportunity is Havala Pye ( If you have questions about the nature of the research please contact the mentor(s).

    Applications will be reviewed starting Nov. 28 and continue until the position is filled.