NYC 9/11 Public Portal Document
Fax: J .i Aug 2 2000 00:37 F'.O9
’ •***^’-5-28-2001 FRI 12:45 PH NiOSH/R-ll FAX NO. 5134587147 P. 05
Centers for Disease Control end Prevention
National institute for Occupational Safety and Health
Interim Air Sampling Report
Saturday, September 22, 2001
investigators from the National institute for Occupational Safety' and Health (NIOSH) collected
air samples in areas immediately adjacent to the debris pile and on personnel actively involved in
rescue eflbrts in the vucinity of the debris pile to characterize potential exposures. Below are ths
interim sampling results lor Saturday, September 22,2001.
Air Samples
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» 4 area air samples were collected for total dust
o Area sample 8-hour time-weighted average concentrations w'cre below 1.0 mg/m’
Dust
» 2 area air samples were collected for respirable dust
o Area sample S-hour time-weighted average concentrations were below 0.05
mg/m’
’ 4 area air samples were collected for metals
o Nothing of concern was found regarding metal analysis
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• 2 area air sampler were collected for crystalline silica
o No crystalline siiicft was detected on cither of the air samples
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• 7 real-time personal breathing zone samples were collected for carbon monoxide
o All 8-haur time-weighted average concentrations were bslow 20 ppm
o A single peak of 1235 ppm was observed on a torch cutter
Mercury
• 11 personal and 2 area air samples were collected for mercury
o No mercury was detected on any of the air samples
SEP. 26 ’01 (PBl) IS 43 COMMUNICaT! ON NstS? PAf.ir b
NYC-WTC_000149469
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