Asbestos Analysis: OSHA With TWA
Asbestos analysis includes testing of air sample for asbestos and other fibers by PCM via NIOSH 7400 and calculating the Time Weighted Average (TWA). TWA's are used for personnel sampling and the most common objective of performing a TWA sampling is for compliance with OSHA limits. More than one sample per individual is required to perform the TWA analysis. The results of the multiple samples per individual are combined to report the TWA.