For construction workers: know the OSHA permissible noise limits, how mixed noise levels add up over a shift, what must happen when noise is too loud, and how to use hearing protection that actually works.
Based on OSHA 29 CFR 1926.52 (Occupational noise exposure) and 29 CFR 1926.101 (Hearing protection) · about 3 min read
Need proof of training? The full course (15 min) adds practice questions, a job scenario, the final quiz and a certificate your employer can verify.
Protection against noise must be provided when sound levels exceed those in Table D-2, measured on the A-scale of a standard sound level meter at slow response (written dBA).
Duration per day
Sound level (dBA, slow response)
8 hours
90
6 hours
92
4 hours
95
3 hours
97
2 hours
100
1½ hours
102
1 hour
105
½ hour
110
¼ hour or less
115
Notice the pattern: the louder the noise, the shorter the time you can be exposed. At 100 dBA the table allows 2 hours, not 8.
If the noise peaks come at intervals of 1 second or less, it is treated as continuous noise.
Impulsive or impact noise should not exceed 140 dB peak sound pressure level.
Most days are not one steady noise. When your day has two or more periods at different levels, their combined effect is considered, not each one alone.
The method
For each period, divide the time you actually spent (T) by the time Table D-2 allows at that level (L). Add the results. The total is called Fe.
The rule: if Fe is more than 1, the exposure exceeds permissible levels.
OSHA's own example
¼ hour at 110 dBA: ¼ ÷ ½ = 0.500
½ hour at 100 dBA: ½ ÷ 2 = 0.25
1½ hours at 90 dBA: 1½ ÷ 8 = 0.188
Total Fe = 0.938. That does not exceed 1, so this exposure is within permissible limits.
Try it: 2 hours at 100 dBA is 2 ÷ 2 = 1.0 by itself. Add any more time at 90 dBA or above that day and the total goes over 1.
Controls first, then hearing protection, plus a program
When sound levels exceed Table D-2, the rule sets an order:
Feasible administrative or engineering controls are used first. The rule does not list examples. Good practice ideas include a quieter tool, a barrier between the noise and the crew, or rotating workers so each spends less time near the noise.
If those controls do not bring sound levels within the table, personal protective equipment must be provided and used to bring them within the table. Wherever it is not feasible to reduce the noise levels or exposure time to the table, ear protective devices shall be provided and used.
In all cases where sound levels exceed the table values, a continuing, effective hearing conservation program must be administered.
Note who does what: "provided and used" means your employer provides the protection, and you use it. Both parts are required.
Earplugs and other devices inserted in the ear must be fitted or determined individually by competent persons.
Plain cotton is not an acceptable protective device.
Good practice: roll foam plugs thin, pull your ear up and back, insert, and hold until they expand. Wear protection the whole time you are in the noise. If plugs hurt or keep falling out, ask to be refitted.
Fact-checked against the regulation text on October 09, 2026. This certificate records completion of awareness training based on OSHA 29 CFR 1926.52 and 1926.101. It is not an OSHA card or license. Neither 29 CFR 1926.52 nor 29 CFR 1926.101 has a training paragraph of its own, so there is no training requirement in these sections for this course to meet. Your employer must still administer a continuing, effective hearing conservation program in all cases where sound levels exceed Table D-2 (1926.52(d)(1)), and make sure that ear protective devices inserted in the ear are fitted or determined individually by competent persons (1926.101(b)).
This guide explains the rule in plain words. Always read the regulation itself and your employer's site-specific procedures.