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0815 1 point ago +1 / -0

Masks do work for the things they were developed for and protect the mask wearer. A real mask will have you breath in through the filter/filters and have a valve for breathing out which lets the outgoing air go out past the filter in order not to break the seal against your face. Some of these masks don't have that valve and are considered short term "protection". Useless for a days work in a hazardous environment.