Hearing protection should be worn any time you’re exposed to sounds at or above 85 decibels for an extended period. That’s the threshold established by the National Institute for Occupational Safety and Health (NIOSH), which recommends no more than eight hours of exposure at 85 dBA. For every 3-decibel increase above that level, the safe exposure time cuts in half. At 88 dB, you have four hours. At 91 dB, two hours. At 100 dB, you’re down to about 15 minutes before damage can begin.
The tricky part is that 85 decibels doesn’t sound dangerously loud. It’s roughly the noise level of heavy city traffic or a busy restaurant. Most people don’t think to protect their ears until something feels painful, but hearing damage starts well before pain does.
Common Noise Levels That Require Protection
A vacuum cleaner runs at about 75 dB, which is safe for prolonged use. But many everyday tools and activities cross the 85 dB line quickly. A power lawn mower hits around 107 dB. A chain saw at three feet reaches 110 dB. A pneumatic chipper at ear level produces roughly 120 dB. At those levels, unprotected exposure becomes harmful in minutes, not hours.
Recreational activities are just as risky. Concerts typically produce sound levels between 90 and 120 decibels, with rock concerts often exceeding 110 dB. Sporting events in enclosed stadiums can reach similar levels. If you attend concerts regularly without ear protection, cumulative damage adds up even if each individual event doesn’t cause noticeable symptoms right away.
Firearms Require Immediate Protection
Gunfire is in a category of its own. Unlike sustained noise from a mower or a concert, a gunshot produces an extremely brief but intense spike of sound called impulse noise. NIOSH studies show that peak sound pressure levels range from 144 dB for a small-caliber .22 rifle up to 172 dB for a .357 revolver. The recommended ceiling for impulse noise is 140 dB, meaning a single unprotected gunshot already exceeds 100% of your daily allowable noise exposure.
Ringing in the ears and a feeling of fullness after shooting are not just temporary annoyances. They’re signs that the inner ear has been stressed and that your protection was either absent or insufficient. Because impulse noise is so intense and so fast, doubling up on protection (earplugs under earmuffs) is a common and strongly recommended practice at shooting ranges.
Children Need Protection at Lower Levels
Infants and young children are more sensitive to loud noise than adults. Their ear canals are smaller, which means the same external sound creates greater pressure inside the ear. Sounds that feel merely loud to an adult can be genuinely harmful to a child. In general, noises below 80 dB are unlikely to damage a child’s hearing unless the exposure lasts several hours, but anything above that warrants protection.
For events like fireworks displays, motorsports, or concerts, noise-canceling headphones or child-sized earmuffs are the simplest solution. Standard adult earmuffs won’t seal properly on a small head, so look for products sized specifically for children or infants.
Passive vs. Electronic Hearing Protection
Passive hearing protection, like foam earplugs and standard earmuffs, works by creating a physical barrier that blocks all sound equally. This is effective and inexpensive, but it also muffles voices, alarms, and other sounds you might need to hear. For situations where you’re mowing the lawn or running a power tool alone, passive protection works perfectly well.
Electronic hearing protection uses built-in microphones and processors to distinguish between harmful and safe sounds. When a loud noise occurs, the device suppresses it instantly. Quieter sounds, like conversation or safety commands, pass through or are even amplified. This makes electronic protection particularly useful at shooting ranges, on construction sites, or in any environment where communication matters. Because users don’t have to remove their protection to talk, they’re more likely to keep it on consistently, which improves real-world effectiveness.
How to Estimate Your Actual Protection
Every hearing protector sold in the U.S. carries a Noise Reduction Rating, or NRR, printed on the packaging. This number tells you how many decibels the device can theoretically block, but real-world performance is almost always lower because lab conditions don’t match how people actually wear the devices.
To estimate your actual protection using an A-weighted noise measurement (the most common type from handheld meters and phone apps), subtract 7 from the NRR, then subtract that result from the noise level you’re exposed to. For example, if you’re using earplugs with an NRR of 33 in an environment measured at 100 dBA: 33 minus 7 equals 26, and 100 minus 26 gives you an estimated 74 dBA reaching your ear. That’s below the 85 dB threshold and safely protective.
NIOSH recently updated its guidance to recommend that employers use individual fit testing to measure how well a specific device actually seals on a specific person, rather than relying solely on the NRR. If your workplace offers fit testing, it’s worth doing. The difference between a well-fitted and poorly fitted earplug can be 10 dB or more.
How to Insert Foam Earplugs Correctly
Foam earplugs are the most widely available and affordable option, but they only work if they’re inserted properly. Most people push them in without compressing them first, which leaves gaps that let noise through.
Start with clean hands. Roll and compress the entire earplug between your thumb and forefinger until it forms a small, wrinkle-free cylinder. Then reach your opposite hand over your head and gently pull your ear upward and outward to straighten the ear canal. Insert the compressed earplug well into the canal and hold it in place for 30 to 60 seconds while it expands. Release, then push inward gently for another five seconds to confirm the seal. When properly inserted, the bottom edge of the earplug sits at the opening of the ear canal, not sticking far out.
If you can easily grab and pull out the earplug without effort, it probably wasn’t deep enough to provide its full rated protection.
Signs That Damage Has Already Started
Noise-induced hearing loss is almost always gradual. You might not notice it for years, which is exactly why prevention matters so much. The earliest signs are subtle: sounds start to seem slightly muffled or distorted, you find yourself turning the TV volume higher than you used to, or you have trouble understanding people in noisy environments like restaurants.
Tinnitus, a persistent ringing, buzzing, or roaring in the ears, is another common signal. It can appear in one or both ears and may come and go at first before becoming constant. Any time you notice ringing after a loud event, that’s your ears telling you the exposure was too much. Next time, wear protection or use better protection than what you had.
The damage from noise exposure is caused by the destruction of tiny hair cells inside the inner ear. Once those cells are destroyed, they don’t regenerate. The hearing loss is permanent. This is why the threshold for wearing protection isn’t based on pain or discomfort. It’s based on the level at which those cells begin to break down, which happens quietly and without warning at 85 dB and above.