My take is as following; I have a FFP2 (european version of a N95) mask with a additional charcoal layer in it, which i carry everyday. The protection provided is limited.
Reasons:
- It folds flat and is small and light enough so I do actually carry it everywhere. A full BA set is not practical and I simply won't carry them with me.
- If a full BA set is needed, you will probably need protective clothing too. Won't carry that with me everyday either.
- If it's not good enough, I’m probably screwed anyways.
- Really inexpensive.
Wrote something about this years ago:
http://safetysecurityandpreparedness.blogspot.com/2013/05/what-is-practical-respirator-for.htmlAlso note; that you cannot just take off your PPE. If you got though a heavily contaminated zone, you will need to be decontaminated. If you are not wearing PPE clothing, just regular stuff. Removing clothing can remove 90% of the contamination. However when removing contaminated clothing, never remove by pulling over your head, as this introduces contaminated to your mouth, nose and eyes.