This dataset includes CMAQ CRACMM output for summer 2023 across the U.S. and Canada for a base simulation and simulation without fires. This data product has been reviewed in accordance with U.S. Environmental Protection Agency policy and approved for public release. At the time of release, the data had not yet been published in peer-reviewed literature. The data is provided for research and the user should verify the data is suitable for their intended use. Data include surface-level hourly concentrations of pollutants for June, vertical pollutant concentrations for June, daily pollutant concentrations for May 1-September 30, and vertical pollutant concentrations at select locations throughout the summer. This dataset can be cited as: Pye, Havala, 2026, "CMAQ v5.5+ CRACMM Gridded Output for Summer 2023 with and without fires over the U.S. and Canada", https://doi.org/10.15139/S3/I7PKE7, UNC Dataverse, V1.