Noise Surveys and Sound Mapping: OSHA Rules and Standards That Apply

Frequently Asked Questions

Does OSHA specifically require sound mapping?

OSHA requires employers to evaluate employee noise exposure under 29 CFR 1910.95, but it does not specifically require a color-coded sound map. Sound mapping is a practical way to organize area measurements and apply the results to signage, PPE, and controls.

What is the difference between personal dosimetry and area noise measurements?

Personal dosimetry measures the employee's actual exposure over time, which is especially useful when tasks and locations change during the shift. Area measurements show how noise varies across the facility and help build sound maps and area-specific hearing protection rules.

When should a facility repeat a noise survey?

A facility should repeat monitoring when production, equipment, layouts, or operating conditions change in a way that could affect exposure. Follow-up is also appropriate when there is reason to believe employee noise exposure has increased.

What standards apply to the instruments used in a noise survey?

In addition to OSHA's occupational noise rule, recognized standards for sound level meters and personal noise dosimeters support accurate measurement. Calibration and clear documentation are also important so the survey results can support decisions.

How do survey results help with hearing protection selection?

Survey results show which employees and areas are at or above key OSHA thresholds and where protection is needed. Area-based recommendations are especially useful for setting minimum hearing protection expectations that supervisors and employees can apply consistently.