1. Department of Microbiology and Environmental Toxicology; University of California, Santa Cruz; California USA
2. Department Chemistry and Biochemistry; University of California, San Diego; La Jolla California USA
3. Department of Atmospheric Sciences; University of Washington; Seattle Washington USA
4. NOAA; Earth Systems Research Laboratory; Colorado USA
5. Air Quality Research Division; Science and Technology Branch, Environment Canada; Toronto Ontario Canada
6. Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
7. NOAA; Pacific Marine Environmental Laboratory; Seattle Washington USA