Harald Stark^1,2, Jordan E. Krechmer², Paola Massoli^2,3, Derek J. Price^4,5, Demetrios Pagonis^1,6, Lucas B Algrim^1,6, Manjula R Canagaratna², Douglas R Worsnop² and Jose L Jimenez^1,6, (1)Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, (2)Aerodyne Research Inc., Billerica, MA, United States, (3)Green Energy Consumers Alliance, Boston, MA, United States, (4)Cooperative Institute for Research in Environmental Sciences, Boulder, United States, (5)University of Colorado at Boulder, Department of Chemistry, Boulder, United States, (6)University of Colorado at Boulder, Department of Chemistry, Boulder, CO, United States