Mayor's office air quality assessment memo, February 2002

NYC 9/11 Public Portal Document Friday 15 of Feb 2002, Mayor Office ->718 595 4544 Page 4 of 4

Some pemcles that appeared to be glass were seen, but they were not m the tomn of lang shards, which can mimic asbestos libers Clean4ip recommendadons All evidence indicates that ambient air m New York City now is little influenced by the World Trade Center coliapse, especial^ since the fires are out and the debns pi'e 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 Ver/fme particles will have penetrated crevices and fabncs m a way normal dust doesn't Ana they aie easily re-suspended, which re-expcses the room's occupants to them Cahill strongly supports the recommendations made by the New York loepartment of Health regarding washing with water, and said - Dont use vacuum cleaners or brooms because they re-suspend particles Do use wet rags, mops and wet-vacuum-type cleaners - Wipe ell surfaces, including window bunds, picture tops and door frames, with wet rags - Drapes and curtains should be washed or dry-cleaned Furniture febncs should be steam-cleaned. Carpets should be wet-cleaned - Use high efficiency electrostatic or HEPA air titers in furnaces and air conditioners - Keep humidity reasonably high indoors, to keep veryfine particles from floating around UC Davie DELTA Group The UC Davis DELTA Group is one of the world's leading research groups in analyzihg the size, composition arid movement of airborne particles DELTA Group scientists analyzing the traoe center samples included Cahill, engineenng professor James Shackelford. Ph D. who led the scanning electron microscopy, chemisny 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 t4ichael jimenez-Cruz. toxicologist Key collaborators from other insttutons were Kevin Perry. Ph D. a former Cahill postdoctoral collaborator and now an assistant professor of meteorology at the University of Utah. Sait 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 ms team of scientists, and Jodye Seicc. Ph D. a visitng professor at UC Daws 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 tne Kuwait oil fires ana two Internationa' ACE studies (for Aerosol Charactenzator, Expenment.!. which ere designed tc shed light on the roles of aerosols m global weather, water polluton and human disease The most recent. ACE-Asia. operated under Natonal Science Foundaton fund,ng with 21 aerosol-sampling sites frorr- Asia to western North Amenca from March through August 2001 DELTA Group currently is continuing analyses of the 2M1 ACE samples, as we« as studies of Alaskan air quality, the nature of diesel-vehicle exhaust the impacts of air poifjtion on human health in California s great Central Valley, and the environmental nealth of the Lake Tahoe Basin For more informatioh. visit the DELTA web site at http Meta ucdavis edu The University of California. Davis, is one of the world's leading institutions m the environmental sciences More than 250 facuty members support an unmatched array of erwironmentai programs m human ana animal health, aghcuture. biological sciences, engineenng. physical sciences, law. social scences. literature and the aits Media eontaetfe): Sylvia Wnght. (530) 752-7704 swnqhtgVicdavis edu

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