Noise-induced hearing loss is permanent but almost entirely preventable. It depends on two things: how loud a sound is and how long you are exposed to it. This guide summarises the main guidelines. It is general information, not medical advice – if you notice changes in your hearing, see a doctor or audiologist.
The key numbers
- Below 70 dBA: considered safe even for long exposure. The US EPA identified 70 dBA averaged over 24 hours as protective over a lifetime.
- 85 dBA: the level at which risk begins with prolonged exposure. NIOSH recommends a maximum of 8 hours a day at 85 dBA.
- Every +3 dB halves the safe time (NIOSH): 88 dBA → 4 hours, 91 dBA → 2 hours, 94 dBA → 1 hour, 100 dBA → 15 minutes, 110 dBA → about 1.5 minutes.
- 140 dB and above: impulse noises such as gunshots or fireworks at close range can cause immediate damage.
US workplace law (OSHA) uses a less protective rule – 90 dBA for 8 hours with a 5 dB exchange rate – but requires hearing-conservation programmes from 85 dBA. Calculate your own daily dose with the noise exposure calculator.
Everyday sounds that add up
Many common activities exceed 85 dB: lawn mowers and leaf blowers (80–95 dB), motorcycles (80–110 dB), concerts and clubs (94–110 dB), sporting events, power tools and music on headphones at high volume. See typical levels on How loud is it?.
Personal listening is a major risk for young people. The WHO's safe-listening guidance recommends keeping weekly exposure within the equivalent of 80 dBA for 40 hours – roughly the "60/60 rule" of listening at no more than 60% volume for no more than 60 minutes at a time is a simple habit that helps.
Warning signs
After loud exposure, watch for:
- Ringing, buzzing or hissing in the ears (tinnitus);
- Muffled hearing, as if your ears are full of cotton;
- Difficulty following conversation in noisy places.
These temporary threshold shifts usually fade within hours or days, but repeated episodes cause cumulative, permanent damage to the hair cells of the inner ear. Sudden hearing loss, pain or persistent tinnitus need prompt medical attention.
Simple protection
- Turn it down. Use volume limits on phones and headphones; noise-cancelling headphones let you listen at lower volume in noisy places.
- Walk away. Doubling your distance from a source lowers the level by about 6 dB, which doubles your safe time.
- Take breaks. Give your ears quiet time during long exposures.
- Wear protection. Foam earplugs, musicians' earplugs (which reduce level evenly across frequencies) and earmuffs are cheap and effective. Use them for mowing, power tools, concerts and motorsport.
- Measure. A phone decibel meter gives a rough idea; for work, use a calibrated sound level meter.
Children
Children's ears are just as vulnerable, and they may not notice or report damage. Use child-sized earmuffs at fireworks, races and concerts, and choose volume-limited headphones for kids.
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