The short answer is that PCM analysis checks for asbestos AND non-asbestos fibers while TEM analysis checks for asbestos specific fibers.
The industry standard (unless it’s a school) is to use PCM air sampling first.
If the total fiber count detected is less than 0.01 fibers per cubic centimeter then the area has passed.
If the PCM air sample is greater than 0.01 fibers/cc then TEM analysis is recommended to check for asbestos specific fibers.
Why not do the TEM analysis first?
This is an option; however, due to the price difference most people decide to only proceed with the TEM analysis, if needed.
Talk to our friendly team to learn more details on asbestos air sampling.