NYC-WTC_000205347

NYC 9/11 Public Portal Document

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Asbestos Air Monitoring Data

This table shows how much asbestos EPA measured in the air at this site, on the dates and times shown. Daily summaries of this data and how it compares to the level of concern for public health are provided on the EPA home page.

EPA can measure asbestos in several ways. For these data tables, EPA is providing measurements in terms of the number of asbestos structures found per square millimeter within our air monitors (structures can include single, overlapping, and bundles of asbestos fibers). The level of concern for asbestos is based on continuous exposure to more than 70 structures per square millimeter for an extended period. Because cleanup efforts will reduce asbestos levels dramatically over the next several weeks, EPA does not expect people exposed to this amount of asbestos to have increased risks of health problems. For IIOS Measurement* Date Time (structures/square millimeter) 10/17/2001 I 6:30 pm to 6:30 am(10/18) Not Detected 10/17/2001' 7:00:00 AM to 7 pm ‘53.3 10/1'6/2001' 6:30 am to 8 pm Not “Detected 10/16/2001 17:00:00 PM to 7 am(10/17) Not Detected 10/15/2001 16:00:00 AM-fo 7:30 pm 80 10/15/2001 17:00:00 PM to 7 am( 10/16) 16 ’10/14^01“ 7:00:00 PM to 7 amC0/15j i 10/14/2001 sl6:30 am to 8 pm Not Detected !!l0/13/200l' ii6?00:00 PM to 7 am(10/14) Not Detected : 10/13/2001 6:00:00 AM to 7 pm Not Detected i 10/12/2001 6:00:00 AM to 7 pm Not Detected 110/12/2001 7:00:00 PM to 6 am(10/13) il Not Detected lIl'O/l 1/2001 17:00:00 AM to’7 pm Not Detected 110/10/2001 16:00:00 AM to 8 pm Not Detected HI0/10/2001 17:00:00 PM to 7 am(10/11) 8 i 10/09/2001 6:30 am to 8 pm Not Detected 10/09/20'01' 7:''00:00 PM to 6 am(10/lb) Not Detected 110/08/2001 17:30 pm to 7:30 am(10/09) Not Detected 110/08/2001 17:00:00 AM to 7 pm ==i

Description of the Benchmarks. Standards, and Guidlines used to Evaluate Environmental Conditions. *The information contained in this database should be considered provisional and may be subject to adjustment upon final analysis.

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NYC-WTC_000205347