Yuzhi Chen¹, Yue Zhang², Andrew T Lambe³, Zhenfa Zhang², Avram Gold², Barbara J Turpin⁴, Andrew P Ault⁵, Jason D Surratt² and Man Nin Chan⁶, (1)University of North Carolina at Chapel Hill, Environmental Sciences and Engineering, Chapel Hill, NC, United States, (2)University of North Carolina at Chapel Hill, Department or Environmental Sciences and Engineering, Gillings School of Global Public Health, Chapel Hill, NC, United States, (3)Aerodyne Research Inc., Billerica, MA, United States, (4)University of North Carolina, Chapel Hill, Department of Environmental Science and Engineering, Gillings School of Global Public Health, Chapel Hill, NC, United States, (5)University of Michigan Ann Arbor, Department of Chemistry, Ann Arbor, MI, United States, (6)The Chinese University of Hong Kong, Hong Kong, Hong Kong