E-mails 2002 M. Gilsenan

NYC 9/11 Public Portal Document

fires are out and the debris pile has cooled.

However, the presence of large amounts of very fine particles as late as October means that indoor clean up should be done carefully, Cahill said. Very fine particles will have penetrated crevices and fabrics in a way normal dust doesn't. And they are easily re-suspended, which re-exposes the room's occupants to them.

Cahill strongly supports the recommendations made by the New York Department of Health regarding washing with water, and said:

-- Don't use vacuum cleaners or brooms because they re-suspend particles. Do use wet rags, mops and wet-vacuum-type cleaners.

-- Wipe all surfaces, including window blinds, picture tops and door frames, with wet rags.

-- Drapes and curtains should be washed or dry-cleaned. Furniture fabrics should be steam-cleaned. Carpets should be wet-cleaned.

-- Use high efficiency electrostatic or HEPA air filters in furnaces and air conditioners.

-- Keep humidity reasonably high indoors, to keep very fine particles from floating around.

UC Davis DELTA Group

The UC Davis DELTA Group is one of the world's leading research groups in analyzing the size, composition and movement of airborne particles. DELTA Group scientists analyzing the trade center samples included Cahill; engineering professor James Shackelford, Ph.D., who led the scanning electron microscopy; chemistry professor Peter Kelly, Ph.D. who led the mass spectroscopy; assistant research engineer Steve Cliff, Ph.D., who is project manager for the synchrotron program, and laboratory and field manager Michael Jimenez-Cruz, toxicologist.

Key collaborators from other institutions were Kevin Perry, Ph.D., a former Cahill postdoctoral collaborator and now an assistant professor of meteorology at the University of Utah, Salt Lake City; Graham Bench, Ph.D., a project investigator at the Center for Accelerator Mass Spectroscopy, U.S. Department of Energy's Lawrence Livermore National Laboratory, and his team of scientists; and Jodye Selco, Ph.D., a visiting professor at UC Davis and a professor of chemistry at the University of Redlands, Redlands, California.

The DELTA Group's many previous research projects include studies of the smoke from the Kuwaiti oil fires and two international ACE studies (for Aerosol Characterization Experiment), which are designed to shed light on the roles of aerosols in global weather, water pollution and human disease. The most recent, ACE-Asia, operated under National Science Foundation funding with 21 aerosol-sampling sites from Asia to western North America from March through August 2001.

DELTA Group currently is continuing analyses of the 2001 ACE samples, as well as studies of Alaskan air quality, the nature of diesel-vehicle exhaust, the impacts of air pollution on human health in California's great Central Valley, and the environmental health of the Lake Tahoe Basin.

For more information, visit the DELTA Web site at: http://delta.ucdavis.edu.

The University of California, Davis, is one of the world's leading institutions in the environmental sciences. More than 250 faculty members support an unmatched array of environmental programs in human and animal health, agriculture, biological sciences, engineering, 5

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