With usual HEPA filters like the xiaomi (its cheap , long lasting big filter) you will get clean room conditions in your flat even in mexico city. I measured 0 ppm <0,3um , when i walked or moved something it rose again :) had a window covered with cardboard and wrapped filter in ductape in front of it, cleanroom overpressure.
Mexico needs a lot filters 🤣
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Funny i thought hours before to simply send the instruction example to you. Thanks man !
