Enter a noise level in decibels (dB) and your daily exposure hours to find out the maximum safe listening duration before hearing damage risk begins. Based on OSHA and NIOSH exposure standards, this Noise Pollution Calculator tells you your permissible exposure time, your noise dose percentage, and whether your current exposure exceeds safe limits.
Max Safe Exposure Time
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Noise Dose (% of Limit)
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Hearing Risk Level
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Safe Time Remaining Today
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Noise pollution refers to any unwanted or harmful sound in the environment that exceeds safe intensity levels. The International Labor Organization defines noise as any sound that may cause hearing loss, damage health, or be dangerous for other reasons. Prolonged exposure to noise above 85 dB can lead to permanent hearing damage.
Sounds above 85 dB are considered potentially harmful with prolonged exposure. At 85 dB, NIOSH recommends no more than 8 hours of daily exposure. As levels rise, the permissible time drops sharply — at 100 dB, the NIOSH limit is just 1 hour, and at 115 dB, only 28 seconds.
OSHA sets a permissible exposure limit (PEL) of 90 dB over 8 hours, using a 5 dB exchange rate — meaning every 5 dB increase halves the allowed time. NIOSH uses a stricter 85 dB limit and a 3 dB exchange rate, which is more protective of hearing. Most hearing health experts recommend the NIOSH standard.
Noise dose is the percentage of the allowable daily noise exposure you have accumulated. A dose of 100% means you have reached the maximum permissible limit for that standard. Doses above 100% indicate overexposure and increased risk of noise-induced hearing loss (NIHL).
Noise-induced hearing loss (NIHL) can be temporary or permanent. Temporary threshold shift (TTS) causes short-term muffled hearing after loud exposure — your hearing may recover after rest. Permanent threshold shift (PTS) occurs after repeated overexposure and causes irreversible damage to the hair cells in the inner ear.
The most effective protection methods include wearing earplugs or earmuffs in noisy environments, limiting the duration of exposure, and increasing your distance from loud sources. In workplaces, engineering controls (sound barriers, quieter machines) and administrative controls (job rotation, scheduled breaks) are also recommended.
No. This calculator provides general guidance based on established OSHA and NIOSH occupational noise exposure standards. It is not a substitute for a professional audiological evaluation. If you are concerned about your hearing or work in consistently loud environments, consult a qualified audiologist or occupational health physician.
The 3 dB exchange rate means that every 3 dB increase in sound level doubles the sound energy, so the permissible exposure time is halved. For example, under NIOSH: 85 dB → 8 hours, 88 dB → 4 hours, 91 dB → 2 hours, and so on. This reflects the actual physics of sound energy accumulation in the ear.