This dataset contains the CMAQ model data provided by EPA/ORD researchers for the Makar et al. (2025) paper. It includes CMAQ model data extracted at monitoring stations, CMAQ gridded annual deposition fields, and CMAQ gridded monthly median diurnal deposition diagnostics. The extracted data at monitoring stations is provided in csv text format while the gridded data is provided in netcdf files. This dataset is associated with the following publication: Makar, P., P. Cheung, C. Hogrefe, A. Akingunola, U. Alyuz, J. Bash, M. Bell, R. Bellasio, R. Bianconi, T. Butler, H. Cathcart, O. Clifton, A. Hodzic, I. Kioutsioukis, R. Kranenburg, A. Lupascu, J. Lynch, K. Momoh, J.L. Perez Camanyo, J. Pleim, Y. Ryu, R. San Jose, D. Schwede, T. Scheuschner, M. Shephard, R. Sokhi, and S. Galmarini. Critical load exceedances for North America and Europe using an ensemble of models and an investigation of causes of environmental impact estimate variability: an AQMEII4 study. Atmospheric Chemistry and Physics. Copernicus Publications, Katlenburg-Lindau, GERMANY, 25(5): 3049–3107, (2025).