I'm interested too, I like post-apocalyptic ideas. I finally found Fungus based Pandemic RP which is not Last of Us fandom.

Anyways, there is a problem, how can everyone find Gas Mask Filters and medical masks? As far as I know, civilian masks are tested before selling and they also have NBC filters which will last 5 hours to 8 hours, may be more. But if toxic level is too much, it will last less. It can go down to 10 minutes. 

Opened filters last 1 years but this rule applies for normal use. Once it installed and exposed with NBC agents, the clock starts. 8 hours to 30 minutes or even less depends on the filter. So... We won't have long time. Also there is a time for Gas Masks too...

Medical Masks can't stop NBC agents most of the time and it's another issue.

But I'm just saying it if we're going to add some realism. Otherwise I have no problem.