What two atmospheric hazards require respiratory protection?

The correct response identifies insufficient oxygen and hazardous airborne contaminants as the two atmospheric hazards that necessitate respiratory protection.

Insufficient oxygen is a serious hazard, as it can lead to unconsciousness or even death if workers are exposed to environments where oxygen levels fall below safe thresholds. Such situations can occur in confined spaces or areas with limited air circulation.

Hazardous airborne contaminants include a variety of materials such as dust, fumes, mists, and particulates that can be detrimental to respiratory health. These contaminants can cause immediate health effects, such as irritation of the respiratory system, as well as long-term conditions, like chronic bronchitis or occupational lung diseases.

Respiratory protection is crucial in environments where these hazards exist, as it serves to protect workers by providing breathable air and filtering out harmful substances present in the atmosphere.