How to Read Official Noise References
A source-backed overview of selected workplace and environmental-noise references, their different indicators, and why this browser estimate cannot establish compliance.
Workplace Noise Standards (OSHA)
In the US, OSHA sets limits for workplace noise exposure:
85 dBA over an 8-hour TWA is OSHA's action level
This action level triggers a hearing-conservation program. OSHA's 90 dBA permissible-exposure table and hearing-protection duties are separate requirements.
| Sound level (dBA, slow) | Permitted duration in OSHA Table G-16 |
|---|---|
| 90 dB | 8 hours |
| 95 dB | 4 hours |
| 100 dB | 2 hours |
| 105 dB | 1 hour |
| 110 dB | 30 minutes |
| 115 dB | 15 minutes or less |
These legal durations cannot be evaluated with this unweighted browser estimate.
OSHA's legal table and NIOSH's recommended limit are different. This unweighted browser estimate cannot establish regulatory compliance. Official sources: OSHA · NIOSH
WHO Environmental-Noise References
WHO guidance uses defined indicators, averaging periods and measurement locations. Selected examples below are context, not thresholds this browser can verify:
Older community-noise reference for bedrooms at night
Older community-noise reference during daytime
Night-noise guideline target using a long-term outdoor indicator
Older community-noise reference during teaching
Residential Noise Limits
There is no universal residential limit. The applicable indicator, receiving location, time period and enforcement method depend on local law.
Daytime Hours (7 AM - 10 PM)
Nighttime Hours (10 PM - 7 AM)
Check your local ordinances - rules vary by city and county
Construction Noise
Construction-noise limits, permitted hours and measurement locations are normally set by local authorities and project conditions.
No universal property-line limit
Time Restrictions
Permitted hours, weekend rules and exemptions vary by jurisdiction
Equipment Requirements
Many cities require mufflers on construction equipment
Enforcement and Complaints
If you experience excessive noise:
- 1.Record dates, times, duration and the apparent source; do not treat this browser estimate as legal evidence
- 2.Check your local noise ordinances (usually available on your city's website)
- 3.Contact your local police department or noise control department
- 4.If measurements are required, follow the authority's method and use suitable calibrated equipment
- 5.Consider mediation before legal action
International Standards
European Union
87 dB(A) daily or weekly exposure limit after protection
80/85 dB(A) lower and upper exposure action values
United Kingdom
85 dB(A) upper exposure action value
137 dB(C) upper peak action value
Australia
Model WHS reference: LAeq,8h of 85 dB(A)
Model WHS reference: LC,peak of 140 dB(C); adopted law varies
OSHA's legal table and NIOSH's recommended limit are different. This unweighted browser estimate cannot establish regulatory compliance. Official sources:
Measure Your Noise Levels
Use the instant estimate only for informal same-device comparisons; use suitable calibrated equipment and the applicable authority for compliance.
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