safety - How are N95 masks different from dust masks

There is a fire raging through my hometown right now. People in the area are advised to be wearing N95 masks to filter out smoke and particulates; and there is misinformation being spread that these masks actually don't work for this purpose.

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Feb 20, 2013 · A dust mask, and N95 type mask, will leak. They are not fit tightly to your face and WILL allow a certain amount of unfiltered air into your nose and mouth while you inhale. A common misconception is that since N95 surgical masks may be used by health care workers or doctors in an operating room, that it must be okay for protection.

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