Noise at Work: A Practical Guide to EU Directive 2003/10/EC Compliance

EU Directive 2003/10/EC on minimum health and safety requirements regarding exposure of workers to risks arising from physical agents (noise) requires employers to assess and manage worker noise exposure. The directive defines exposure action values and limit values expressed as the daily personal noise exposure LEX,8h and the peak sound pressure level Lpeak. Where exposures approach or exceed the action values, employers must implement noise control measures and provide hearing protection.

Action Values and Limit Values

• Lower exposure action values: LEX,8h = 80 dB(A); Lpeak = 135 dB(C)
• Upper exposure action values: LEX,8h = 85 dB(A); Lpeak = 137 dB(C)
• Exposure limit values (including attenuation of hearing protection): LEX,8h = 87 dB(A); Lpeak = 140 dB(C)
• At the lower action value: provide information and training; hearing protection available on request
• At the upper action value: mandatory hearing protection zone; engineering controls required

ISO 9612 Measurement Methodology

• Task-based strategy — measure sound levels during each representative task; weight by task duration fraction
• Job-based strategy — select jobs and workers representative of the workforce; measure full working periods
• Full-day measurement strategy — measure one complete working day for a sample of workers
• All strategies require Type 1 (Class 1) integrating sound level meters or equivalent measurement chains
• Field calibration check required before and after each measurement period
• Measurement uncertainty must be stated in the assessment report

Practical Measurement Tips

• Carry out measurements during normal production conditions — not during abnormal high-noise events
• Include all significant noise sources: machine noise, intermittent events, impact noise
• Assess peak sound pressure levels separately — impulsive and impact noise requires peak measurement capability
• Document the measurement conditions, tasks observed, production rates, and any deviations from normal

PLACID Class 1 measurement microphone sets with calibrated signal conditioning are appropriate for the measurement chain in ISO 9612 noise at work assessments. Contact PLACID for a system specification appropriate for occupational noise assessment surveys.

Documenting the Measurement Chain for the Assessment Report

ISO 9612 requires the measurement report to identify the instrumentation, state the calibration status, and present the measurement uncertainty. The calibration certificate reference, the accreditation body, and the certificate validity period must be stated. Field calibrator check results — before and after each measurement session — must be recorded and included in the report. PLACID ISO/IEC 17025 accredited calibration certificates provide the traceability information required by ISO 9612 and by HSE enforcement officers who review occupational noise assessment reports.