EPA air asbestos monitoring data, World Trade Center site

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EPA Newsroom EPA Monitoring Site: Northern Median strip of Vesey and West St.

=E= Information Sources Asbestos Air Monitoring Data

This table shows how much asbestos EPA measured in the air at this site, on the Educational Resources dates and times shown. Daily summaries of this data and how it compares to the About EPA level of concern for public health are provided on the EPA home page. Progr„„s 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 Opportunmcs millimeter within our air monitors (structures can include single, overlapping, and Jobs 3# bundles of asbestos fibers). The level of concern for asbestos is based on Recursos en Espanol continuous exposure to more than 70 structures per square millimeter for an extended period. Because cleanup efforts will reduce asbestos levels F- n -4 dramatically over the next several weeks, EPA does not expect people exposed to this amount of asbestos to have increased risks of health problems.

Measurement (structures/square Date Time millimeter) 12:01 a.m. to 12:00 14.8 , A 9/30/2001 p.m. 12:00 p.m. to laiW 9/29/2001 44.5 a.m. ... 9/29/2001 Not detected p.m. :

9/28/2001 Not detected a.m. 12:00 p.m. to 12:00 M 9/28/2001 29.6 a.m. 12:01 a.m. to 12:00 9/27/2001 14.8 p.m.

9/27/2001 29.64 a.m. ■ J 9/26/2001 izdiam?to12:bo p.m. 29.64 ___ 9/26/2001 a.m. 118.5*

9/25/2001 12;0ia^m7to12^0T Not detected p.m i '■ --J' hI 9/24/2001 2:bblxm7tb7;b6 p.m. Not detected

2:00 a.m. to 2:00 9/24/2001 Not detected p.m. 2:00 p.m. to 2:00 9/23/2001 Not detected a.m.

1 of2 10/3/2001 1:03 PM

NYC-WTC_000141106