Comparison of occupational noise legislation in the Americas: an overview and analysis.
Level 5 - mechanism / opinion, no new human data
Comparative review of statutory documents and policy without primary human health or trial data (graded by design analogy)
PubMed 25209041 · doi:10.4103/1463-1741.140511
What was done
Authors conducted a comparative policy review of occupational noise legislation, standards, and regulations across 22 countries in the Americas (Latin America, Canada, and the United States). Legal information was retrieved from official government sources, the International Labour Organization database, and professional contacts in each country. The analysis examined permissible exposure limits, exchange rates, and impulsive noise exposure limits.
What was found
Twenty-seven percent of the 22 countries lacked regulations on permissible noise levels and exchange rates. Among nations with regulations in place, 81% specified a permissible exposure limit of 85 dBA. Across the entire region, 32% of nations mandated both an 85 dBA limit and a 3-dB exchange rate. Most countries limited impulsive noise exposure to a peak unweighted sound pressure level of 140 dB (or dBC), with a few enforcing lower thresholds.
Why it matters
This overview highlights substantial disparities and regulatory gaps in worker protection across the Americas, showing that over a quarter of evaluated countries lack statutory workplace noise limits.
Limits
The review relies on statutory presence without evaluating real-world enforcement, compliance, or auditory health outcomes. Information sourcing partly depended on informal networks rather than standardized legal searches, and jurisdiction-level variations within federal countries are not detailed in the abstract.
Cited by
- supports According to the 3-decibel exchange rate, safe continuous sound exposure duration halves for every 3 dB increase in volume, allowing 8 hours at 80 dB, 4 hours at 83 dB, and 30 minutes at 92 dB.