Slowing the spread is all about doing as much as possible to contain the virus. A one-way filter does not stop the spread from both sides as well as a two-way

Slowing the spread is all about doing as much as possible to contain the virus. A one-way filter does not stop the spread from both sides as well as a two-way filter. Then again - as long as you're wearing any kind of mask, you're making a difference. Wear a good one that protects you and others if you want this BS to be over sooner. Wear none if you want to be that guy in every zombie movie that doesn't take the first infected seriously and dooms the planet.