What is the purpose of a Noise Source Survey?

• A. To measure WBGT
• B. To define thermal stress zones
• C. To classify whether a noise source output exceeds the criterion level of 85 dBA and could present a potential exposure hazard to workers
• D. To update AFI 48-151

Answer: (C)

The main idea here is identifying which noise sources could pose a hearing risk and deserve control efforts. A Noise Source Survey focuses on evaluating each piece of equipment or process to see if its noise output meets or exceeds the criterion level of 85 dBA, which is the threshold used to flag potential exposure hazards for workers. If a source is above that level, it indicates a potential exposure risk and helps you target engineering or administrative controls and hearing protection measures where they’re most needed. The other options relate to heat stress (WBGT and thermal zones) or to policy updates, neither of which address evaluating loudness or hazard at noise sources.