1. Department of Civil, Architectural, and Environmental Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania19104, United States
2. International Centre for Integrated Mountain Development, Khumaltar, Lalitpur, 44700Kathmandu, Nepal
3. Department of Chemistry, University of Iowa, 230 North Madison Street, Iowa City, Iowa52242-1294, United States
4. Department of Environmental Sciences, Emory University, 400 Dowman Drive, Atlanta, Georgia30322, United States
5. Department of Chemistry, University of Montana, 32 Campus Drive, Missoula, Montana59812, United States
6. Department of Environmental Health and Engineering, John Hopkins University, 3400 North Charles Street, Baltimore, Maryland21218, United States