Combined Aerosol and Trajectory Tool (CATT)

Through a grant from MANE-VU, MARAMA funded Dr. Rudy Husar of Washington University in St. Louis for work on the Combined Aerosol and Trajectory Tool (CATT). CATT is a relational database and query system allowing connectivity to multiple measured aerosol and receptor model data sets and gridded trajectory data. This facilitates pairing wind trajectories with aerosol data to help identify the location of sources of air pollutants that impair visibility.

The data analysis community anticipates that using this tool will provide important information about potential source regions affecting Class I areas and will help set priorities for emissions inventory improvement projects as well as control strategy developments. The results should also provide useful insights into sources contributing to regional background concentrations of PM2.5.

For more information read the Fact Sheet - February 2005 (Adobe Acroat® format) or visit the Combined Aerosol/Trajectory Database Tool website.

EPA Resources

  • AIRData: Access to Air Pollution Data (exit MARAMA)
    The AirData Web site provides access to yearly summaries of United States air pollution data, taken from EPA's air pollution databases. There is also a collection of user-friendly visualization tools for air quality analysts. The tools generate maps, graphs, and data tables dynamically.

  • AIRNow (exit MARAMA)
    The U.S. EPA, NOAA, NPS, tribal, state, and local agencies developed the AIRNow Web site to provide the public with easy access to national air quality information, daily AQI forecasts as well as real-time AQI conditions for over 300 cities across the US, and provides links to more detailed State and local air quality Web sites.

  • Air Quality System Data MART (exit MARAMA)
    The AQS Data Mart is designed to make air quality data more accessible and useful to the scientific and technical community and is available for public access to AQS data from 1980 to present.

  • Air Trends Website

  • Ambient Air Monitoring Network Assessment Guidance: Analytical Techniques for Technical Assessments of Ambient air Monitoring Networks (EPA-454/D-07-001, February 2007)

  • EnviroFlash (exit MARAMA)
    EnviroFlash is a system that sends e-mails about your daily air quality forecast. The message is the same air quality information that the local radio or television stations provide, plus suggested safety measures when levels are unhealthy. This service is provided by your state or local environmental agency and the U.S. EPA.

Other Data Analysis Tools and Resources