1. Center for Atmospheric Particle Studies Carnegie Mellon University Pittsburgh PA USA
2. Now at CIRES University of Colorado Boulder CO USA
3. College of Engineering University of Georgia Athens GA USA
4. Civil and Environmental Engineering Portland State University Portland OR USA
5. Now at Department of Chemical and Environmental Engineering and College of Engineering–Center for Environmental Research and Technology (CE‐CERT) University of California Riverside CA USA
6. Department of Chemistry University of Montana Missoula MT USA