This dataset is non-EPA-owned. Some of the analyses are based on previous use of CMAQ emissions and meteorological files for the ALPACA period. The links to those ScienceHub entries are attached. Portions of this dataset are inaccessible because: Non-EPA-owned data by the first author. They can be accessed through the following means: Contact Natalie Brett (natalie.brett@latmos.ipsl.fr) or Steve Arnold (S.Arnold@leeds.ac.uk). Format: Analyses in this paper are based on model simulations (described in a previous paper) that used EPA data (netCDF files containing CMAQ emissions and meteorological inputs). See the associated links above which will be published upon publication of the associated manuscripts. This dataset is associated with the following publication: Brett, N., S. Arnold, K. Law, J. Raut, T. Onishi, B. Barret, E. Dieudonné, M. Cesler-Maloney, W. Simpson, S. Bekki, J. Savarino, S. Albertin, R. Gilliam, K. Fahey, G. Pouliot, D. Huff, and B. D'Anna. Estimating Power Plant Contributions to Surface Pollution in a Wintertime Arctic Environment. ACS ES&T Air. American Chemical Society, Washington, DC, USA, 2(5): 943-956, (2025).