Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 6 2008 10.5194/acpd-8-20019-2008 http://www.atmos-chem-phys-discuss.net/8/20019/2008/ http://www.atmos-chem-phys-discuss.net/8/20019/2008/acpd-8-20019-2008.html http://www.atmos-chem-phys-discuss.net/8/20019/2008/acpd-8-20019-2008.pdf 20019 20050 2008-11-28 Real-time observation of secondary aerosol formation during a fog event in London M. Dall'Osto R. M. Harrison r.m.harrison@bham.ac.uk H. Coe P. Williams National Centre for Atmospheric Science, Division of Environmental Health & Risk Management, School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK National Centre for Atmospheric Science, School of Earth, Atmospheric & Environmental Sciences, The Univ. of Manchester, Simon Building Oxford Road, Manchester M13 9PL, UK A fog event was monitored with state-of-the art real-time aerosol mass spectrometers in an urban background location in London (England) during the REPARTEE-I experiment. Specific particle types rich in hydroxymethanesulphonate (HMS) were found only during the fog event. Formation of inorganic and organic secondary aerosol was observed as soon as fog was detected and two different mechanisms are suggested to be responsible for the production of two different types of aerosol. 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