Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 4 2009 10.5194/acp-9-1393-2009 http://www.atmos-chem-phys.net/9/1393/2009/ http://www.atmos-chem-phys.net/9/1393/2009/acp-9-1393-2009.html http://www.atmos-chem-phys.net/9/1393/2009/acp-9-1393-2009.pdf 1393 1406 2009-02-20 Severe ozone air pollution in the Persian Gulf region J. Lelieveld lelieveld@mpch-mainz.mpg.de P. Hoor P. Jöckel A. Pozzer P. Hadjinicolaou J.-P. Cammas S. Beirle Energy, Environment and Water Research Centre, The Cyprus Institute, 20 Kavafi Street, 1645 Nicosia, Cyprus Max Planck Institute for Chemistry, Becherweg 27, 55128 Mainz, Germany Observatoire Midi-Pyrénées, CNRS – Laboratoire d'Aérologie, 14 Avenue E. Belin, 31400 Toulouse, France Recently it was discovered that over the Middle East during summer ozone mixing ratios can reach a pronounced maximum in the middle troposphere. 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