Asbestos Fibers Monitored After 9/11
The New York City Department of Environmental Protection also conducted an additional analysis for all samples that were above 0.01 f/cc.
This measurement protocol is called transmission electron microscopy (TEM) and counts the number of asbestos fibers in the sample.
EPA reported their data in TEMs, and provides a good explanation of the interpretation of the standard that uses this methodology on their Web site.
Courtesy of The EPA
The New York DEP analyzed air samples in lower Manhattan