Breathable air must meet minimum requirements for which grade of breathable air as described by CGA?

Breathable air must meet minimum requirements for which grade of breathable air as described by CGA?

• A. Grade A
• B. Grade B
• C. Grade D
• D. Grade F

Answer: (C)

Breathable air used in respirators is defined by CGA standards, which describe a minimum quality level for air intended to be breathed. Grade D is that minimum: it means the air has no noticeable odor, taste, or irritation and meets acceptable contaminant limits so it’s safe to breathe. In practice, supplied-air programs require air that meets Grade D or better, making Grade D the baseline standard. The other grades describe higher or different quality levels, but they aren’t the baseline minimum for breathable air.

Breathable air used in respirators is defined by CGA standards, which describe a minimum quality level for air intended to be breathed. Grade D is that minimum: it means the air has no noticeable odor, taste, or irritation and meets acceptable contaminant limits so it’s safe to breathe. In practice, supplied-air programs require air that meets Grade D or better, making Grade D the baseline standard. The other grades describe higher or different quality levels, but they aren’t the baseline minimum for breathable air.