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Noise is a recognized form of pollution, but it is difficult to measure because the annoyance or discomfort it causes varies between individuals. There is evidence that hearing sensitivity among young Americans is decreasing because of exposure to noise, including overly amplified music. Apart from hearing loss, excessive noise can cause sleeplessness, ulcers, high blood pressure, and possibly heart disease. A 2005 study found that city residents are willing to pay how much for noise reduction? Discuss
Source: The Free Dictionary