1. Department of Chemistry and Biochemistry, and Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado, USA
2. Aerodyne Research Inc., Billerica, Massachusetts, USA
3. Tofwerk AG, Thun, Switzerland
4. Department of Environmental Sciences, Policy and Management, University of California, Berkeley, California, USA
5. Department of Civil and Environmental Engineering, University of California, Berkeley, California, USA
6. Institute for Marine and Atmospheric Research Utrecht, Utrecht, The Netherlands
7. Aerosol Dynamics, Inc., Berkeley, California, USA
8. Department of Atmospheric Sciences, University of Washington, Seattle, Washington, USA