1. Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, Boulder, Colorado 80303, United States
2. Department of Civil, Architectural, and Environmental Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
3. Department of Chemistry, University of Montana, Missoula, Montana 59812, United States
4. International Centre for Integrated Mountain Development (ICIMOD), Lalitpur 44700, Nepal
5. Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
6. Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States
7. Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, Maryland 21205, United States