Have you checked your gas masks lately for fit, tears, worn valves, in-date filters?. Have you tested it with either banana oil or vanilla extract for seal-ability. Do you know how to use one, how to replace the filter? Do you have some at the ready, at home, in your vehicle?. This might be a wake up call why you should. Report: Al-Qaida aims to hit U.S. with WMDs - Security- msnbc.com After an incident isn't the time for this.