@drensber @berman_allen @sameo416 Study measuring filtration showed 72% reduction in exposure to aerosols with universal "cloth" masks. Is this "safe"? Probably not, but it is 3-4x safER.
@drensber@berman_allen@sameo416的过滤测试研究表明，使用通用“布”口罩的气溶胶暴露量减少了72%。这“安全”吗？可能不会，但安全性是3-4倍。