To cite package ‘appc’ in publications use:

  Brokamp C, Manning E, Duan Q (2025). _appc: Air Pollution Predictor
  Commons_. R package version 0.5.0, ,
  <https://github.com/geomarker-io/appc>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {appc: Air Pollution Predictor Commons},
    author = {Cole Brokamp and Erika Manning and Qing Duan},
    year = {2025},
    note = {R package version 0.5.0, },
    url = {https://github.com/geomarker-io/appc},
  }