A negative exposure assessment can be demonstrated by which of the following conditions?

A negative exposure assessment signifies that there is no significant risk of exposure to asbestos fibers in a given environment. This can be effectively demonstrated by prior monitoring that has yielded high certainty about the absence of asbestos-containing materials or fibers in the air that workers would otherwise inhale.

When monitoring is conducted consistently and the results show negligible or no levels of asbestos, it provides assurance that the environment is safe for workers. This often involves historical data or recent measurements that confirm the air quality remains within acceptable limits when it comes to asbestos fibers.

In contrast, the other conditions would not validate a negative exposure assessment. For instance, if a product is known to release large amounts of fibers, this would inherently indicate a risk of exposure. Similarly, asserting that a product is safe for all levels of exposure lacks the rigorous evidence typically necessary to substantiate a negative exposure assessment. Finally, while protective clothing can mitigate the risk of exposure, it doesn't eliminate it and thus doesn't directly demonstrate a negative exposure environment. Monitoring with high certainty stands as the most compelling evidence to affirm that there is no significant risk of exposure to asbestos.