1. Office of Air Quality Planning and Standards U.S. Environmental Protection Agency Research Triangle Park NC USA
2. National Exposure Research Laboratory U.S. Environmental Protection Agency Research Triangle Park NC USA
3. NASA Langley Research Center Hampton VA USA
4. Department of Environmental Sciences University of Virginia Charlottesville VA USA
5. Department of Chemistry University of California Berkeley CA USA
6. Department of Earth and Planetary Science University of California Berkeley CA USA
7. National Center for Atmospheric Research Boulder CO USA
8. Institute of Arctic and Alpine Research University of Colorado Boulder Boulder CO USA