Millions of workers are required to wear respirators in a variety of workplaces throughout the country, because they can offer protection from areas that have inadequate oxygen levels as well any areas that may have harmful dusts, fogs, smokes, mists, gases, vapors, and sprays. These hazards can cause cancer, impairment of lung function, or even death. Being in compliance with the OSHA Respiratory Standard could prevent hundreds of deaths and thousands of illnesses every single year.