[1] Univ Reading, Dept Meteorol, Reading RG6 6BB, Berks, England
[2] Los Alamos Natl Lab, Earth Syst Observat, Los Alamos, NM USA
[3] Univ Manchester, Natl Ctr Atmospher Sci, Manchester, Lancs, England
[4] Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester, Lancs, England
[5] Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester, Lancs, England
[6] Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England
[7] Univ Hertfordshire, Natl Ctr Atmospher Sci, Hatfield AL10 9AB, Herts, England
[8] Univ Reading, Dept Meteorol, Natl Ctr Atmospher Sci, Reading RG6 6BB, Berks, England
[9] Ctr Ecol & Hydrol, Penicuik, Midlothian, Scotland
[10] Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England
[11] Univ Leicester, Natl Ctr Atmospher Sci, Leicester, Leics, England
[12] Paul Scherrer Inst, Lab Atmospher Chem, Villigen, Switzerland
[13] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[14] Kings Coll London, Sch Biomed Sci, London, England
[15] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England
[16] King Abdulaziz Univ, Dept Environm Sci, Jeddah 21413, Saudi Arabia
[17] King Abdulaziz Univ, Ctr Excellence Environm Studies, Jeddah 21413, Saudi Arabia
[18] Univ Birmingham, Div Environm Hlth & Risk Management, Birmingham, W Midlands, England
[19] Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England
[20] Univ Edinburgh, Sch Chem, Edinburgh, Midlothian, Scotland
[21] Univ Leeds, Sch Chem, Leeds LS2 9JT, W Yorkshire, England
[22] Aerodyne Res Inc, Ctr Atmospher & Environm Chem, Billerica, MA USA
[23] Univ York, Natl Ctr Atmospher Sci, York YO10 5DD, N Yorkshire, England
[24] MRC, Publ Hlth England Ctr Environm & Hlth, London, England
[25] Kings Coll London, London, England
[26] Univ York, Natl Ctr Atmospher Sci, York YO10 5DD, N Yorkshire, England
[27] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England
[28] Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA
[29] Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England
[30] Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England
[31] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA
[32] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA
[33] Univ Hertfordshire, Ctr Atmospher & Instrumentat Res, Hatfield AL10 9AB, Herts, England
[34] Univ Lancaster, Lancaster Environm Ctr, Lancaster, England
[35] Aerodyne Res Inc, Ctr Aerosol & Cloud Chem, Billerica, MA USA
[36] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA