i honestly have no idea where i came down with something. i worn an n95 inside public spaces at all times, worn an n95 in city centers and anywhere where i could be within 20 feet of someone. inside stores, which i go to rarely, i'm always >= 6 feet away from someone.
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N95 is still far from perfect. A lot of them even have little rows of holes in the filters for structure since they can still meet the requirements for the certification.
Also depends a lot on it being well fitted / sealed so the elastomeric ones work a lot better in practice.
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If you live in apartment/condo inside a bigger building you probably have some air circulation with the rest of the building. I can tell there's a lot of air coming into this condo around the edges of the door. Weather stripping I used to stop moths coming in isn't thick enough.