A noise dose is defined as ...

A noise dose is defined as ...

• A. The ratio of actual exposure to the allowable exposure, expressed as a percent
• B. The difference between actual exposure and allowable exposure, expressed in dB
• C. The average exposure over a workday, expressed as a ratio
• D. The maximum instantaneous level divided by PEL

Answer: (A)

Noise dose expresses how much of the allowable daily exposure has been used, by comparing the actual exposure duration at given noise levels to the permissible exposure duration at those levels, and then presenting that as a percent. It’s a time-weighted measure that combines level and duration to show what fraction of the daily limit has been consumed. For example, if the allowable exposure for a certain level corresponds to 8 hours and you’ve accumulated 4 hours at that level (or higher), the dose is 50%. When you reach 100%, you’ve hit the daily limit. This concept isn’t about a simple decibel difference, nor a plain average of the day, nor a single instantaneous level divided by a PEL; dose requires accounting for how long you were exposed at various levels and how that adds up against the allowable durations.

Noise dose expresses how much of the allowable daily exposure has been used, by comparing the actual exposure duration at given noise levels to the permissible exposure duration at those levels, and then presenting that as a percent. It’s a time-weighted measure that combines level and duration to show what fraction of the daily limit has been consumed. For example, if the allowable exposure for a certain level corresponds to 8 hours and you’ve accumulated 4 hours at that level (or higher), the dose is 50%. When you reach 100%, you’ve hit the daily limit. This concept isn’t about a simple decibel difference, nor a plain average of the day, nor a single instantaneous level divided by a PEL; dose requires accounting for how long you were exposed at various levels and how that adds up against the allowable durations.