![]() ![]() The unit used to measure frequency is called a hertz (Hz). The number of vibrations or cycles in one second. Special ear plugs or coverings put in or on our ears to block out unwanted noise. The unit used to measure sound level (loudness). The louder the sound, the larger the wave and the more sound energy received by the ear. Sources of noise pollution can include machinery (industrial equipment, lawn mowers, vacuum cleaners), music equipment (loud stereos, loudspeakers), and transportation vehicles (trucks, busses, planes, etc.) Vocabulary Amplitude Hearing damage can occur quickly from extremely loud noises, such as explosions, or over a period of many years from constant exposure to loud sounds. Noise pollution is unwanted, usually loud sounds which can interfere with and damage hearing.
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