Decibel Chart: How Loud Are Common Noises?
Every hearing-protection decision starts with the same question: how loud is the thing I'm doing? This chart answers it for the most common noise sources, then shows the exposure limits that turn a decibel number into a yes-or-no on ear muffs.
How to read decibels
Decibels are logarithmic, which breaks everyday intuition. Every 3 dB increase doubles the sound energy hitting your ears, and every 10 dB increase sounds roughly twice as loud. A 100 dB leaf blower isn't "a bit worse" than a 90 dB mower — it delivers ten times the energy. Distance matters just as much: sound drops about 6 dB with every doubling of distance from the source, which is why stepping back from the speakers or the firing line is free protection.
Decibel levels of common noises
| Noise source | Typical level | Hearing protection |
|---|---|---|
| Normal breathing | 10 dB | None |
| Whisper | 30 dB | None |
| Quiet office | 40 dB | None |
| Moderate rainfall | 50 dB | None |
| Normal conversation | 60 dB | None |
| Vacuum cleaner | 70–75 dB | None |
| Heavy city traffic (inside car) | 80–85 dB | Optional |
| Kitchen blender | 85–90 dB | Recommended if prolonged |
| Gas push mower | 85–95 dB | Recommended |
| Riding mower | 90–100 dB | Recommended |
| String trimmer | 90–100 dB | Recommended |
| Motorcycle (rider) | 95–100 dB | Recommended |
| Leaf blower | 95–105 dB | Needed |
| Concert or nightclub | 95–110 dB | Needed |
| Sporting event (crowd peaks) | 95–110 dB | Needed |
| Circular saw | 100–110 dB | Needed |
| Jackhammer (operator) | 100–110 dB | Needed |
| Chainsaw | 105–115 dB | Needed — high NRR |
| Emergency siren (close) | 110–120 dB | Needed |
| Jet takeoff (at ~100 ft) | 130–140 dB | Muffs + plugs |
| Fireworks (close range) | 140–150 dB | Muffs + plugs |
| Gunshot (at the shooter's ear) | 140–175 dB | Muffs; add plugs indoors |
Levels vary with equipment, venue and distance — treat these as planning figures, not measurements of your specific mower. A phone sound-meter app gets you a usable estimate for your own gear.
How long is too long?
Two US benchmarks matter. OSHA's limits are what employers must legally meet; NIOSH's recommendations are what hearing scientists consider actually protective, using a stricter 3 dB exchange rate. The gap between them is why "OSHA-legal" job sites still produce hearing loss over a career.
| Sound level | OSHA permissible | NIOSH recommended |
|---|---|---|
| 85 dB | Action level — hearing program required at 8 h | 8 hours |
| 90 dB | 8 hours | ~2.5 hours |
| 95 dB | 4 hours | ~47 minutes |
| 100 dB | 2 hours | 15 minutes |
| 105 dB | 1 hour | ~5 minutes |
| 110 dB | 30 minutes | ~1.5 minutes |
| 115 dB | 15 minutes | Under 30 seconds |
Impulse noise is its own category: a single unprotected gunshot or close firework can cause immediate, permanent damage regardless of duration, which is why shooters protect for every shot.
Turning this into a purchase
Match the chart to a protector: sources in the 85–100 dB band are handled by NRR 22–27 muffs; 100+ dB calls for NRR 27–31, and sustained 105+ dB or any indoor shooting justifies muffs and plugs together. Remember that label ratings overstate real-world protection — the derating math is in NRR ratings explained. From there, jump to the guide for your source: mowing and yard work, shooting or work.
Frequently asked questions
At what decibel level do I need ear muffs?
For sustained noise, 85 dB is the widely used threshold — roughly the point where you must raise your voice to be heard at arm's length. For impulse noise like gunfire or fireworks, protection is warranted at any exposure.
How many decibels do ear muffs block?
Consumer and industrial muffs carry NRR labels from about 20 to 31 dB. Real-world attenuation runs lower than the label — expect roughly half to two-thirds of the rated figure with a good fit.
Is 70 dB harmful to hearing?
No. Sustained exposure below about 80-85 dB is not associated with hearing damage. Levels in the 70s can still be annoying or fatiguing, but they don't require hearing protection.