@article{Escudero:75583,
      author        = "Escudero, M. and Lozano, A. and Hierro, J. and Tapia, O.
                       and Valle, J. del. and Alastuey, A. and Moreno, T. and
                       Anzano, J. and Querol, Xavier",
      title         = "{Assessment of the variability of atmospheric pollution in
                       national parks of mainland Spain}",
      year          = "2016",
}