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You would need a mask that will filter out chemical contagions, biological, as well as radioactive particulates. Your best masks have different filters available. One big lens masks are preferable to double lens models like the one you have pictured op. In my opinion. If you are really serious about getting one. I found the best solution was no joke diving gear. Nothing enters a sealed system. If you have the set up to charge your own tanks. It works very well for short excursions into your own little area of the wasteland. Also it is something that you and your loved ones can use prior to any kind of event taking place so it does not look unusual to have. If you live in an area with a lot of lakes rivers or on the ocean you can also enter the water and put some serious distance between you and any potential enemy combatants unless nuclear fallout has occurred, or other water born contamination. You should get a good mask and keep it in your vehicle or pack at all times women are lucky they can carry one concealed in their purse. Also having several general cotton bio masks is a very good idea. They are easily concealed as well.