1. Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
2. Department of Atmospheric Sciences, Texas A&M University, College Station, Texas 77843, United States
3. Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, Villeurbanne 69626, France
4. Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
5. Department of Environmental Health Sciences, University of Michigan, Ann Arbor, Michigan 48109, United States
6. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States