[1] NOAA, Aeron Lab, REAL7, Boulder, CO 80303 USA
[2] NOAA, Environm Technol Lab, Boulder, CO 80303 USA
[3] Brookhaven Natl Lab, Upton, NY 11973 USA
[4] US EPA, NERL, Res Triangle Pk, NC 27711 USA
[5] Tennessee Valley Author, Environm Res Ctr, Muscle Shoals, AL 35660 USA
[6] NOAA, Air Resources Lab, Silver Spring, MD 20910 USA
[7] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA