This is a respirator, also known as an N95 mask. These respirators have the filter built into the mask and are usually designed for limited use and disposal, although when supplies are short they can be reused as long as they still provide a good fit and are not clogged so as to make breathing difficult. They sometimes have an exhalation valve that allows exhaled air to escape directly without being filtered so as to make breathing easier. The unit in this picture also provides source control.

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Pic: Astronaut Kate Rubins wearing a respirator.