About the CMAS Data Warehouse category

Use this category to ask questions, request or share data on the CMAS Data Warehouse on AWS.

CMAS Data Warehouse on AWS collects and disseminates meteorology, emissions, and air quality model input and output for Community Multiscale Air Quality (CMAQ) Model Applications.


  • This repository is available as part of the AWS Open Data Program, therefore egress fees are not charged to either the host or the person downloading the data.

  • These public S3 buckets are hosted by the CMAS Center on behalf of the U.S. EPA’s Office of Research and Development, and the U.S. EPA’s Office of Air and Radiation.

  • Metadata for the datasets in the CMAS Data Warehouse are available from the CMAS Dataverse site: https://dataverse.unc.edu/dataverse/cmascenter