Which filters are used for protection against airborne asbestos fibers?

The correct choice is based on the filtration efficiency and suitability of filter types for protecting against airborne asbestos fibers. N100, R100, and P100 filters are designed to capture at least 99.97% of airborne particles, including very small particles such as asbestos fibers, which are often less than 1 micron in size. The "N" designation indicates that the filter is not resistant to oil, the "R" indicates some resistance to oil, and the "P" indicates that it is oil-proof. However, in the context of asbestos exposure, P100 filters are particularly relevant due to their high efficiency in filtering out hazardous particles, including asbestos.

While the other choices represent different levels of protection, they do not provide the same level of efficiency as P100 filters. For example, N95 and R95 filters only capture up to 95% of airborne particles and may not be adequate for environments with high levels of asbestos. The N50, R50, and P50 filters further decrease in filtration efficiency, capturing only 50% of particles, and thus are inadequate for asbestos protection. Similarly, N70, R70, and P70 filters only provide 70% filtration efficiency, which again fails to meet the high standard required