Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI, USA

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

Department of Civil and Environmental Engineering, University of California, Berkeley, CA, USA

Lawrence Berkeley National Laboratory, Berkeley, CA, USA

Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA

Department of Atmospheric Sciences, Texas A{&}M University, College Station, TX, USA

Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, USA