Remember, for a mask or any other PPE to be effective it must be donned BEFORE the incident. You will most likely have no warning of the release of the agent, especially the release of a bio agent as the incubation period can be as long as 12 days.<br><br>Masks are good if:<br>You have it with you at all times.<br>If you have the correct filters, the mask integrity is not compromised and the fit is correct.<br>If you have enough warning to don the mask before you contact the agent.<br><br>I would be much more concerned about chem agents as they are easier to produce, do not require specific conditions to thrive and are easier to disperse.<br><br>Just my humble opinion.<br><br><P ID="edit"><FONT SIZE=-1><EM>Edited by REELDOC on 09/24/01 08:01 PM (server time).</EM></FONT></P>