OSHA Noise & Hearing Conservation in Construction: 90 dBA PEL and the 85 dBA Myth

The enforceable OSHA construction noise permissible exposure limit (PEL) is 90 dBA as an 8-hour time-weighted average (TWA) under 29 CFR 1926.52 — not 85 dBA. The widely cited 85 dBA action level comes from the general industry standard, 29 CFR 1910.95, and it is not a federal construction trigger. Confusing the two leads crews to the wrong compliance line. This guide explains the correct numbers, the permissible exposure durations, the 5 dB exchange rate, and what construction employers must actually do.

At a glance: Construction noise PEL = 90 dBA TWA (1926.52); the 85 dBA action level is general-industry (1910.95), not a federal construction trigger; above Table D-2, construction still needs a hearing conservation program (1926.52(d)(1)). A 5 dB exchange rate halves permissible time every 5 dB (95 dBA = 4 hrs, 100 = 2 hrs). The OSHA construction noise permissible exposure limit is 90 dBA as an eight-hour time-weighted average under 29 CFR 1926.52, not 85 dBA, which is the general-industry action level under 1910.95; a 5 dB exchange rate halves the permissible time for every 5 dB above 90, and above those levels construction requires a continuing, effective hearing conservation program.

The Core Distinction: 90 vs 85 dBA

The takeaway: in construction, the legal limit you measure against is 90 dBA TWA under 1926.52. The 85 dBA figure is a general-industry action level under 1910.95(c) — useful as a best practice, but not a federal construction requirement.

The 85 dBA Myth in Construction

Because hearing-conservation training materials are often written for general industry, the 85 dBA action level gets repeated so often that many assume it is the construction limit. It is not. Under 29 CFR 1910.95, general industry employers must implement a formal hearing conservation program at the 85 dBA 8-hour TWA action level (audiometric testing, training, recordkeeping). In construction, the binding standard is 1926.52, which sets the PEL at 90 dBA TWA.

The myth cuts both ways. Construction has no federal 85 dBA trigger, but it is wrong to conclude that construction needs no hearing conservation program: 1926.52(d)(1) requires "a continuing, effective hearing conservation program" in all cases where sound levels exceed the Table D-2 values. What 1926.52 does not do is list the program's contents. The element list, audiometric testing, and the 85 dBA action level are written out only for general industry, in 1910.95(c)-(n), so many construction programs borrow that structure as a model.

State Plans can make 85 dBA binding on construction. Washington, for example, applies its hearing loss prevention chapter (chapter 296-817 WAC), with hearing protection, training, and audiometric testing at 85 dBA TWA8, to construction work through WAC 296-155-145. Check your State Plan before you rely on the federal floor. Using the wrong number can lead to either over-engineering controls or, more dangerously, misunderstanding the actual compliance trigger.

Permissible Exposure Durations and the 5 dB Exchange Rate

Under 1926.52, permissible noise exposure uses a 5 dB exchange rate: for every 5 dB increase above 90 dBA, the allowable exposure time is cut in half.

Two more rules sit beside the table. When the daily exposure combines periods at different levels, their combined effect counts, not each period alone (1926.52(d)(2)(i)). Noise with maxima at intervals of one second or less is treated as continuous (1926.52(c)), and impulsive or impact noise should not exceed 140 dB peak sound pressure level (1926.52(e)). When a worker's exposure exceeds these permissible levels, the employer must act.

What Construction Employers Must Do

Under 1926.52, when noise exposure exceeds the permissible levels:

• Use feasible administrative or engineering controls first (e.g., equipment maintenance, isolation, rotating workers, scheduling loud tasks).
• If controls do not reduce exposure within permissible limits, provide and ensure use of personal protective equipment (hearing protectors, 1926.101(a)); fit insert-type protectors individually by a competent person (1926.101(b)), and never accept plain cotton (1926.101(c)).
• Administer a continuing, effective hearing conservation program whenever exposures exceed Table D-2 (1926.52(d)(1)).
• Measure and document exposures so you know whether the 90 dBA PEL is exceeded.
• Apply the 5 dB exchange rate when evaluating exposures above 90 dBA.
• Beyond the federal minimum, consider starting hearing conservation measures (training, monitoring) at 85 dBA, and apply them where your State Plan requires it.

Common Mistakes to Avoid

• Treating 85 dBA as the construction PEL. It is the general-industry action level under 1910.95, not the 1926.52 construction limit.
• Saying construction needs no hearing conservation program. 1926.52(d)(1) requires a continuing, effective one whenever sound levels exceed Table D-2.
• Citing 1910.95 on construction sites. The construction standard is 1926.52.
• Ignoring the 5 dB exchange rate. Exposure limits tighten quickly above 90 dBA.
• Jumping straight to earplugs. OSHA expects feasible engineering/administrative controls first, with PPE when controls are insufficient.

The standard, tools & related reading

• The standards: Occupational Noise Exposure — 1926.52 (construction) · Hearing Conservation — 1910.95 (general industry)
• On the job: Noise Exposure Calculator · PPE Selector
• Related guides: PPE for Construction — Complete Guide · Respiratory Protection Program
• 2026 OSHA penalty schedule · penalties by state