![]() ![]() Construction equipment, farm machines, and the din of machinery inside factories can be dangerously loud. Most noise pollution comes from machines, especially automobiles, trucks, and aircraft. By 140 decibels, sound becomes painful to the human ear, but ill effects, including hearing loss, set in at much lower levels. Speech runs 65 to 70 decibels heavy traffic generates 90 decibels. In the wilderness, a typical sound level would be 35 decibels. The decibel scale is logarithmic and climbs steeply: An increase of about three decibels is a doubling of sound volume. ![]() Sound intensity is measured in units called decibels. Although loud and frightening sounds are part of nature, only in recent centuries has much of the world become urban, industrial, and chronically noisy. Noise Pollution or Sound Pollution, exposure of people or animals to levels of sound that are annoying, stressful, or damaging to the ears. ![]()
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