Noise Exposure Limits: HPD_SNR
Occupational noise exposure limits, action levels, and hearing protector ratings per OSHA 29 CFR 1910.95 (5 dB exchange rate, 90 dBA PEL, 85 dBA action level), NIOSH REL 1998 (3 dB exchange rate, 85 dBA), ACGIH TLV 2024 (3 dB exchange rate, 85 dBA), EU Directive 2003/10/EC (80/85/87 dBA thresholds), and ISO 1999:2013. Includes time-weighted average duration limits at each exposure level, HPD noise reduction ratings (NRR per ANSI S3.19 and SNR per EN ISO 4869-2) for foam plug/earmuff/dual protection, and octave-band A-weighting correction factors (63–8000 Hz) per IEC 61672-1.
| regulatory framework | exposure parameter | notes | parameter type | standard document |
|---|---|---|---|---|
| HPD_SNR | dual_protection_snr38 | Dual protection combined SNR; recommended when L_Aeq > 100 dBA; SNR_combined = higher SNR + 5 dB | hpd_rating | EU/ISO |
| HPD_SNR | earmuff_snr30 | SNR 30 dB; typical over-ear earmuff EU SNR rating; effective protection = L_Aeq - SNR | hpd_rating | EU/ISO |
| HPD_SNR | foam_earplug_snr35 | SNR 35 dB; foam earplug EU rating per EN ISO 4869-2; effective protection = L_Aeq - SNR | hpd_rating | EU/ISO |
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