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Asbestos and Other Fibers by Phase Contrast Microscopy (PCM) – NIOSH Method 7400
NIOSH method is used for the analysis of asbestos in air by PCM. Results are reported as
fibers per cubic centimeter and depend on the volume of air sampled. PCM analysis is not
asbestos fiber specific. It will count all fibers meeting the criteria for fiber determination.
Interim Transmission Electron Microscopy (TEM) Analytical Methods (Appendix A to
Subpart E of Part 763)
This method is used for the analysis of asbestos in air by TEM. Results are reported as
structures per square millimeter and are specific for the determination of asbestos fibers
present in the sample. This procedure is typically required for final re-occupancy criteria.
Mandatory and nonmandatory sections are examined to determine the completion of
response actions.