This repository pulls together all the pieces used to run v3.5.1 of WRF-Chem with the R2SMH mechanism, including WRF-Chem itself, WPS, NEI emissions conversion, MEGAN biogenic emissions preparation, and MOZART based MOZBC initial and boundary condition preparation. All these components are tied together using the AutoWRFChem-Base code to automate their execution. Note: downloading the tar.gz or .zip files will not provide a working copy as all the code is contained in Git submodules. The primary purpose of this repository is to be transparent about the modifications made to WRF-Chem and the attending utilities for use in generating NO2 a priori profiles for work done as part of the paper "Quantification of the effect of modeled lightning NO2 on UV-visible air mass factors". While all the submodules contained within are available to be pulled from GitHub, these are not the official versions of these respective utilities. Follow the links below for the official download sites for each of the utilities used herein: WRF-Chem: http://www2.mmm.ucar.edu/wrf/users/download/get_source.html WPS: http://www2.mmm.ucar.edu/wrf/users/download/get_source.html NEI intermediate utility: ftp://aftp.fsl.noaa.gov/ MEGAN biogenic model: https://www2.acom.ucar.edu/wrf-chem/wrf-chem-tools-community MOZBC initial/boundary condition utility:https://www2.acom.ucar.edu/wrf-chem/wrf-chem-tools-community The authors of these utilities/models reserve all rights to their code not specifically released in their respective licenses.