Abstract
Measuring asbestos fibers in the atmosphere is necessary for any risk management strategy. This paper outlines the latest revision of the asbestos monitoring manual published by the Ministry of the Environment and presents health risks associated with asbestos. Before 2010, only chrysotile has been analyzed, and after that, total fibers were measured, so caution is required when evaluating data. The current (2017) testing method requires counting the total number of fibers by phase contrast microscopy (PCM) and identifying asbestos types using scanning electron microscopy (SEM) in cases of total number of fibers 1f/L or greater. Phase contrast/ polarization microscopy and phase difference/ fluorescence microscopy are used as rapid measurement methods at construction demolition sites where asbestos leaking and scattering to the air is often reported. On-site real-time measurement is also done. This paper summarizes the results of the asbestos concentration survey (2010 2019) conducted by the Ministry of the Environment are summarized. Chrysotile around the old asbestos factory has been observed to be 1f/L or higher. At demolition sites and crushing facilities, asbestos fibers are often found at a total fiber count of 1f/L or more, making it necessary to check the areas frequently through monitoring them. Because asbestos measurement using a microscope rely upon the naked eye of the observer, analysts must pay attention to quality control for counting.
