In which situation would a special respirator be appropriate

When employees must work in environments with insufficient oxygen or where harmful dusts, fogs, smokes, mists, fumes, gases, vapors, or sprays are present, they need respirators. These health hazards may cause cancer, lung impairment, other diseases, or death

Explanation:

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;

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