This data archive supports the publication by Skipper et al. 2024 describing development of updates to secondary formaldehyde production in CRACMM version 2 and evaluation against satellite-, aircraft-, and ground-based formaldehyde observations. Links are provided to the CMAQ and CRACMM code repositories, FIREX-AQ aircraft observations, and several formaldehyde surface observation datasets. The contents of the zip file are detailed in the README.txt file. The zip file contains the exact CMAQ code used to run the CMAQ simulations described in the paper, paired observation-model csv files for several species, as well as datasets and code that can be used to recreated the figures in the main text of the paper. Data and code for recreating the figures can also be found on github (https://github.com/tnskipper/hcho_cracmm2_paper).