1. a Department of Civil and Environmental Engineering , Rice University , Houston , TX , USA
2. b School of Sustainable Engineering and the Built Environment , Arizona State University , Tempe , AZ , USA
3. c Department of Chemistry and Biochemistry , Arizona State University , Tempe , AZ , USA
4. d Pinal County Air Quality Control District , Florence , AZ , USA
5. e U.S. Environmental Protection Agency, Office of Air and Radiation , Las Vegas , NV , USA
6. f U.S. Environmental Protection Agency, Office of Research and Development , Las Vegas , NV , USA