gas mask

masklike device worn to protect the face and lungs from poison gases or chemicals

A gas mask is a mask worn over the face to protect the body from airborne pollutants and toxic materials. The mask forms a sealed cover over the nose and mouth, but may also cover the eyes and other vulnerable soft tissues of the face. Some gas masks are also respirators, though the word gas mask is often used to refer to military equipment (e.g. Field Protective Mask, etc.)
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gas-mask /'gæsmɑ:sk/
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MASCHERA ANTIGAS

n. หน้ากากป้องกันแก๊ซพิษ; หน้ากากป้องกันแก๊ซ