Ultrafine Particles in the Atmosphere Discussion Meeting 15 and 16 March 2000 Day 1; Tape 1 side A; Welcome Prof J H Vincent, Prof R M Harrison, discussion Prof G R Cass; side B Prof G R Cass continued, discussion Dr A D Maynard Tape 2 side A; Dr A D Maynard continued, discussion Dr N Collins; side B Dr N Collins continued, discussion Prof P Mc Murry Tape 3 side A; Prof P McMurry continued, Discussion Dr D Derwent; side B Discussion Prof D B Kittelson, discussion Tape 4 side A; discussion continued, Prof H Buckhorn, Prof J H Vincent; side B Prof J H Vincent continued, discussion Day 2 Tape 5 side A; Chair Prof A Seaton, Dr D L Costa, Question Dr D A Jefferson; side B Dr Jefferson continued, Questions Dr C Kim Tape 6 side A; Dr C Kim, Prof P Gehr; side B Dr P Gehr continued, Questions Prof G Oberdoster Tape 7 side A; Prof G Oberdorster continued, Questions Prof K Donaldson; side B Prof K Donaldson, Chair Prof RL Maynard, Dr H E Wichmann, questions Tape 8 side A; Questions continued, Prof H R Anderson; side B Prof H R Anderson continued, Questions Prof M Lippmann Tape 9 side A; Prof Lippmann continued, questions 15/03/2000