I have a spring trip to Italy and England planned and am working on selecting masks for purchase. I found this article, from a commercial source, a comprehensive source about wearing, storing and when to dispose of N95 and KN95 masks. Thought some of you might be interested,
https://sunlinesupply.arnoldsofficefurniture.com/blog/when-to-change-surgical-mask/
Now I have to decide if I am actually going to take this trip since it feels like 2020 all over again.