What type of respirator would be selected when working in an area where ammonia can be released?

When working in an area where ammonia can be released, selecting a self-contained breathing apparatus (SCBA) is appropriate due to the potential for high concentrations of ammonia, which can pose serious respiratory hazards. An SCBA provides a clean supply of air from a tank, protecting the user from inhaling hazardous gases or vapors present in the environment.

While half mask and full face respirators are designed to filter out specific contaminants in the air, they may not provide sufficient protection against high concentrations of ammonia. These types of respirators rely on filters that can become saturated or clogged, rendering them ineffective in environments with heavy exposure or where the ammonia concentration could exceed the filters' capacities.

A dust mask is not suitable for protection against chemical gases, including ammonia, as it is designed primarily for filtering out particulate matter and does not provide a secure seal or adequate filtration for harmful vapors.

In environments where there is a risk of ammonia exposure, using a self-contained breathing apparatus ensures that a worker is completely protected from inhaling toxic substances, thus prioritizing safety and compliance with occupational health regulations.