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N95 is the best for Dr. working in the closed HVAC env, for outdoor and shopping, L1-L3 surgical mask might be better actually.

The material to make N95 is the time consuming part, I think Houston can do it but not sure if any company created the production line. Without those raw material, there will always be N95 shortage, building it in USA is not cost-effective in the past.

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Keep in mind that polypropylene meltblown material (main filtering material) is used in surgical masks just as much, as well as polypropylene spunbond, but somehow they are produced in enough quantity everywhere in the world to satisfy demand of the whole world. The only extra material that surgical masks don't use is probably just "hot air cotton", but it isn't a filtering material, it's a spongy form making material and I doubt there is a shortage of it, given that KN95 and other FFP3/FFP2 masks that use it are available in many countries today and were available all summer.

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