This reproducibility package accompanies the manuscript “Simulations of a High Ozone Episode and Heatwave Day Using a Coupled Multi-layer Urban Canopy and Chemistry Model.” It contains the curated WRF-Chem initial/ boundary conditions, emissions, gridded observational products, and Jupyter notebooks used to regenerate the figures, analyses, and statistics in the paper. The bundle is organised as follows: data/ – WRF-Chem history files, NASA GCAS regridded products, flight tracks, shapefiles, and observational time series (see data/README.md). wrf/ – Run-ready directories for the Bulk, BEP, and BEP-BEM experiments, including the modified source files (wrf_mods.zip) and chemistry reconstruction script (wrf/README.md). notebooks/ – Notebooks 01–04 that reproduce manuscript Figures 3–14; use the provided environment.yml to recreate the Python environment. outputs/ – Destination for regenerated figures. Split archives: The large data/ and wrf/ directories are divided into 1 GB chunks for Zenodo, using the naming scheme data.tar.gz.part* and wrf.tar.gz.part*. After downloading all parts, recombine and extract them with: cat data.tar.gz.part* > data.tar.gz cat wrf.tar.gz.part* > wrf.tar.gz tar -xzf data.tar.gz tar -xzf wrf.tar.gz