What is the Criterion level used as the basis for measuring a noise standard?

What is the Criterion level used as the basis for measuring a noise standard?

• A. 85 dBA
• B. 55 dBA
• C. 65 dBA
• D. 140 dBA

Answer: (A)

The main idea here is that a noise standard is based on a reference or criterion level—the level at which a standard’s dose calculation is anchored. This criterion level is the noise level used to determine whether exposure over a workday meets the limit; it’s the point at which the “dose” reaches 100% for an 8-hour period when using the standard exchange rate. For most occupational noise guidance, that reference level is 85 dBA. At this level, an 8-hour exposure equates to 100% dose; exposures higher than 85 dBA reduce the allowable time, while exposures lower than 85 dBA allow longer periods before reaching 100% dose. The other numbers listed aren’t used as the baseline for measuring the standard: 140 dBA is typically associated with peak levels rather than the ongoing dose baseline, and 55 or 65 dBA are well below the typical criterion used for dose calculations.

The main idea here is that a noise standard is based on a reference or criterion level—the level at which a standard’s dose calculation is anchored. This criterion level is the noise level used to determine whether exposure over a workday meets the limit; it’s the point at which the “dose” reaches 100% for an 8-hour period when using the standard exchange rate.

For most occupational noise guidance, that reference level is 85 dBA. At this level, an 8-hour exposure equates to 100% dose; exposures higher than 85 dBA reduce the allowable time, while exposures lower than 85 dBA allow longer periods before reaching 100% dose. The other numbers listed aren’t used as the baseline for measuring the standard: 140 dBA is typically associated with peak levels rather than the ongoing dose baseline, and 55 or 65 dBA are well below the typical criterion used for dose calculations.