NYC 9/11 Public Portal Document
• A lack of data results for many pollutants,
• An absence of health benchmarks for asbestos and other pollutants,
• Imprecise optical asbestos sampling methodologies, and
• Over 25 percent of the bulk dust samples collected before September 18
showed the presence of asbestos above the 1 percent benchmark.
EPA did not have monitoring data to support reassurances made in press releases
up to September 18 because it lacked monitoring data for several contaminants,
particularly PCBs, particulate matter, dioxin, and PAHs.
According to a draft evaluation entitled Exposure and Human Health Evaluation
ofAirborne Pollution from the World Trade Center Disaster, by EPA’s Office of
Research and Development, that Office was not able to make health risk
evaluations for exposures in the first couple of days because of the lack of
monitoring data. For several pollutants of concern, sampling did not begin until
September 16, and in many cases the results were not known until after the
September 18 press release was issued. EPA was not able to obtain samples and
monitor air due to difficulties in access and security, power supply sources,
equipment availability, and analytical capacity. As a result, data available before
September 18 for making conclusions about air quality for pollutants other than
asbestos was limited.
Table 2-2 shows when air monitoring began and when the data results first
became available for each pollutant of concern.
10 Report No. 2003-P-00012
NYC-WTC_000145365
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