Atmos. chem. phys. Atmos. chem. phys. Phenomenology of summer ozone episodes over the Madrid Metropolitan Area, central Spain Querol X. Alastuey A. Gangoiti G. Perez N. Lee H.K. Eun H.R. Park Y. Mantilla E. Escudero M. Titos G. Alonso L. Temime-Roussel B. Marchand N. Moreta J.R. Revuelta M.A. Salvador P. Artíñano B. Dos Santos S.G. Anguas M. Notario A. Saiz-Lopez A. Harrison R.M. Millán M. Ahn K.-H. 2018 research-article