To cite RAQSAPI in publications use:

Mccrowey C, Sharac T, Mangus N, Jager D, Brown R, Garver D, Wells B, Brittingham H (2021). A R Interface to the US EPA Air Quality System Data Mart API. https://cran.r-project.org/package=RAQSAPIhttps://github.com/USEPA/RAQSAPIhttps://aqs.epa.gov/aqsweb/documents/data_api.html.

Corresponding BibTeX entry:

  @Manual{,
    title = {A R Interface to the US EPA Air Quality System Data Mart
      API},
    author = {Clinton Mccrowey and Timothy Sharac and Nick Mangus and
      Doug Jager and Ryan Brown and Daniel Garver and Benjamin Wells
      and Hayley Brittingham},
    year = {2021},
    url = {https://cran.r-project.org/package=RAQSAPI},
    url = {https://github.com/USEPA/RAQSAPI},
    url = {https://aqs.epa.gov/aqsweb/documents/data_api.html},
  }