If you seriously think you were exposed to noxious gases I would not trust responses in an internet forum for practical advice. I would contact either my GP, a clinic or a state agency assigned to deal with chemical spills and public exposure.

My guess is the precautions and warnings are probably pretty extreme in order to underline the seriousness of true exposure but the reality may be that the risk of actual exposure, which would result in a health risk, is pretty low. But that's my guess. I'm just some guy in BF's- I wouldn't even trust my advice on this one!