@exsibilation @FinchTH Probably both to some extent, but filtration isn't much better. There are lots of filtration test papers for various masks.
@exsibilation @FinchTH 在某种程度上可能两者兼而有之，但过滤也好不了多少。各种口罩的过滤试纸很多。
@exsibilation @FinchTH Probably both to some extent, but filtration isn't much better. There are lots of filtration test papers for various masks.
@exsibilation @FinchTH 在某种程度上可能两者兼而有之，但过滤也好不了多少。各种口罩的过滤试纸很多。