This dataset includes CMAQ input data for the CRACMM2 chemical mechanism for a 12/01/2024 - 12/31/2025 simulation over the Continental US. The files are consistent with CMAQv5.5 CRACMM2, but data can be used in CMAQv5.4 and later and all versions of CRACMM with appropriate adjustments. Data include emissions, meteorology, fertilizer information, lightning information, model initial chemical conditions, and surface information for the domain. This dataset continues the collection of years for which CRACMM inputs across the U.S. are publicly available (currently 2018, 2019, 2020, 2022, and 2023). This dataset can be cited as: US EPA, 2026, "CMAQ Model Version 5.5 CRACMM2 CAP-HAP Input Data – 12/01/2024 - 12/31/2025 12km CONUS", https://doi.org/10.15139/S3/JYXFZY, UNC Dataverse, V1.