1. Department of Mechanical Engineering, Colorado State University, Fort Collins 80525, Colorado, United States
2. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder 80309, Colorado, United States
3. Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder 80305, Colorado, United States
4. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Boston 02139, Massachusetts, United States
5. Department of Atmospheric Science, Colorado State University, Fort Collins 80525, Colorado, United States
6. Department of Chemistry and Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder 80309, Colorado, United States
7. Environmental Science, Policy, and Management, University of California Berkeley, Berkeley 94720-3114, California, United States
8. Department of Chemical Engineering, California Institute of Technology, Pasadena 91125, California, United States
9. Aerodyne Research Inc., Billerica 01821, Massachusetts, United States
10. Department of Chemistry, Montana State University, Bozeman 59717, Montana, United States
11. Department of Civil and Environmental Engineering, University of California Davis, Davis 95616, California, United States