Final answer:
While wearing a chemical, biological, and radiological protective mask, you are not protected against high concentrations of toxic substances or extremely high levels of radiation.
Step-by-step explanation:
While wearing a chemical, biological, and radiological protective mask, there are certain tactical concentrations that you are not protected against. These include high concentrations of extremely toxic substances or extremely high levels of radiation. For example, chemical warfare agents (CWAs) can be lethal and may require specialized protective equipment beyond a standard protective mask. Similarly, in high-level radiological incidents, such as a nuclear meltdown, the levels of radiation may exceed the protective capabilities of a mask alone. It is important to have appropriate training and follow safety protocols when working with hazardous substances or in environments with high levels of radiation to ensure maximum safety and protection.