School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA

now at: Institute of Chemical Engineering and High Temperature Chemical Processes (ICEHT), Foundation for Research and Technology Hellas (FORTH), Patras, Greece

School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA

School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA

School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA

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

School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA

National Center for Atmospheric Research, Boulder, CO, USA

now at: Laboratory for Atmospheric Research, Department of Civil & Environmental Engineering, Washington State University, Pullman, Washington, USA

Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico

Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico

Department of Chemistry, University of California Berkeley, Berkeley, CA, USA

Department of Chemistry, University of California Berkeley, Berkeley, CA, USA