NYC-WTC_000208376

NYC 9/11 Public Portal Document

Table 2b Fibers in Settled Dust for 366 Broadway and the upper Manhattan Comparison Area (percent of fibers in sample)

366 Broadway* Comparison Area* Fibers Common Outdoor Residence Residence Common Outdoor Residences In Dust Area #1 #2 Area Asbestos ND NS ND ND ND NS ND (PLM) Asbestos ND NS ND ND ND NS ND (TEM) SVF 5 NS 5 ND ND NS ND (PLM) *Results are maximum values found in location PLM = polarized light microscopy TEM = transmission electron microscopy NS = not sampled ND = not detected SVF = synthetic vitreous fibers

Conclusions/Recommendations The results of air and settled dust samples were compared to a variety of health-based standards and guidelines. Theoretical exposure scenarios were also developed to determine potential impacts. The results of air sampling in your building, and for all of the buildings that were sampled in lower Manhattan, did not show the presence of a public health hazard. However, based on unlikely worst­ case assumptions, it is not possible to rule out adverse health effects from chronic, 30 year, exposures to crystalline silica and asbestos.

More asbestos, SVF (primarily fiberglass), mineral components of concrete (quartz, calcite, and portlandite), and mineral components of building wallboard (gypsum, mica, and halite) were found in settled surface dust in many lower Manhattan residential areas when compared to comparison residential areas. The DOHMH and ATSDR, therefore, recommend that people living in lower Manhattan continue frequent cleaning with HEPA vacuums and damp cloths/mops to reduce the potential for exposure. These cleaning methods can prevent substances from becoming airborne and lower the possibility of exposure and long-term health effects.

Lower Manhattan residents concerned about possible World Trade Center-related dust in their residences can request information, cleaning, and/or testing from the U.S. Environmental Protection Agency (EPA) on the agency's World Trade Center web page at www.epa.gov/wtc and from the EPA hotline, l-(877)-796-5471.

For a more complete discussion of the results, their limitations, and their meaning we encourage you to read the enclosed Executive Summary or view the complete report on our web page at www.nvc.gov/health.

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