Some other studies [1] have shown that N95 valved masks are as effective at filtering exhaled droplets as unvalved cotton masks, and considerably more effective than improvised things like bandannas and neck gaiters. It makes some sense - the valve lets a lot of droplets out, but the rest of the N95 mask is probably a far better filter than a cotton mask.
It doesn't contradict the claim in this article, but it's an interesting thing to ponder about the risk of the general public having seemingly all standardized on cotton masks.
It doesn't contradict the claim in this article, but it's an interesting thing to ponder about the risk of the general public having seemingly all standardized on cotton masks.
[1] https://advances.sciencemag.org/content/6/36/eabd3083