To cite package ‘airqualityES’ in publications use:

  Die J (2024). _airqualityES: Air Quality Measurements in Spain from
  2011 to 2018_. R package version 1.0.0,
  <https://github.com/jdieramon/airqualityes>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {airqualityES: Air Quality Measurements in Spain from 2011 to 2018},
    author = {Jose V. Die},
    year = {2024},
    note = {R package version 1.0.0},
    url = {https://github.com/jdieramon/airqualityes},
  }