A mask to stop what? An expolsion, fire, chemical attack, dirty bomb? the named N-100 are really particle and droplets only.

They won't remove vapors, smoke, etc. Although the N100 will stopdroplets, onces these droplets starts to voprize, you will breath them it. The carbon version's of these mask won't have sufficient carbon to stop any significant amount of chemical vapor.

The named M-100 masks will NOT provide protection to a chemical attack.
They will prevent you from breathing in particals, including radioactive particals.