School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA

now at: Combustion Research Facility (CRF), Sandia National Laboratories, Livermore, California, USA

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA

now at: Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA

College of Environmental Sciences and Engineering, Peking University, Beijing, China

Office of Air Quality Planning & Standards, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA

Atmospheric Research & Analysis, Inc., Cary, North Carolina, USA

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA