@article{242187,
      url = {http://digitallibrary.un.org/record/242187},
      title = {Effects of air pollutants on human health : air quality  guidelines /},
      publisher = {UN,},
      recid = {242187},
      pages = {4 p. :},
      address = {Geneva :. 1987-04-10},
      year = {1987},
      month = {Apr},
}