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A noise's potential to do harm to hearing depends on its intensity, which is measured in decibels (dB), and its duration. Generally, a "safe" noise level registers 75 dB or less. However, as noise levels increase, it takes less exposure to affect your hearing. For instance, a person without hearing protection could be safely exposed to a sound at 85 dB for 8 hours, but at 120 dB for only 7 minutes. (Decibel increases are logarithmic, so 90 dB is 10 times as loud as 80 dB, and 110 dB is 20 times as loud as 90 dB.) With every 5 dB increase in noise, your safe exposure time is cut in half.
Noise Thermometer is available for sale in both poster and flier formats.
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Click on Noise Thermometer
to enlarge
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