Re: NBC, ABC, & CBR . . .
The biggest requirement in the survival of a contaminant attack is -- knowing you've been attacked. Chances are, any warning would be too late for the average clever Joe to run to his car, office, home to don the mask he wasted money on to save his life. The mask needs to be within arm's reach 24 hours a day, and only the truly paranoid will do this.
Also, who is going to tell you that your area is all clear? Where is the local chem test kit?
Dan