What is ISO 9612?

ISO 9612:2009 is the international standard for determining occupational noise exposure. It specifies methods for measuring noise levels and calculating worker exposure with quantified uncertainty.

The standard requires rigorous documentation, proper sampling strategies, and uncertainty calculations—all of which SoundPLANmanda handles automatically.

Key ISO 9612 Requirements

• ✅ Task-based or job-based sampling strategy
• ✅ A-weighted equivalent sound pressure level (LAeq)
• ✅ C-weighted peak sound pressure level (LCpeak)
• ✅ Combined uncertainty calculation
• ✅ 8-hour normalized exposure level (LEX,8h)

Task-Based

Identify discrete work tasks, measure noise during each task, and combine based on task durations.

Job-Based

Take random samples throughout the workday for workers with similar noise exposure patterns.

Full-Day

Continuous measurement over entire shift using dosimeters or logging sound level meters.

⚠️ Insufficient number of measurements

Solution: SoundPLANmanda recommends minimum sample sizes based on your chosen strategy

⚠️ Ignoring uncertainty in conclusions

Solution: Software applies upper confidence limit when comparing to exposure limits

⚠️ Poor documentation of measurement conditions

Solution: Built-in fields capture equipment, calibration, environmental factors

⚠️ Not accounting for impulsive noise

Solution: LCpeak values tracked and reported alongside LAeq measurements