To cite package 'openair' in publications use:

Carslaw DC, Ropkins K (2012). “openair — An R package for air quality data analysis.” Environmental Modelling & Software, 27–28(0), 52–61. ISSN 1364-8152, doi:10.1016/j.envsoft.2011.09.008.

Corresponding BibTeX entry:

  @Article{,
    title = {openair --- An R package for air quality data analysis},
    author = {David C. Carslaw and Karl Ropkins},
    journal = {Environmental Modelling & Software},
    volume = {27--28},
    number = {0},
    pages = {52--61},
    year = {2012},
    issn = {1364-8152},
    doi = {10.1016/j.envsoft.2011.09.008},
  }