NYC 9/11 Public Portal Document
Table 2a Fibers in Air for Building 26 and the upper Manhattan Comparison
Area (fibers per cubic centimeter of air)
Building 26 Comparison Area*
Fibers in Air Common Outdoor Residence Residence Common Outdoor Residences
Area #1 #2 Area
Total Fibers 0.004 0.001 0.012 <0.001 0.002 0.001 0.003
(PCM)
Asbestos <0.001 NA <0.001 NA NA NA NA
(TEM)
Fiberglass <0.00004 NA <0.00004 NA 0.00004 0.00004 0.00009
(SEM)
*Results are maximum values found in the comparison area
PCM = phase contrast microscopy
TEM = transmission electron microscopy
SEM = scanning electron microscopy
NA = not analyzed
Table 2b Fibers in Settled Dust for Building 26 and the upper Manhattan
Comparison Area (percent of sample containing fibers)
Building 26 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)
Fiberglass 5 NS ND ND ND NS ND
(PLM)
*Results are maximum values found in the comparison area
PLM = polarized light microscopy
TEM = transmission electron microscopy
NS = not sampled
ND = not detected
CONFIDENTIAL, CITY_21MC100_003434276
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000176159
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