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During the last twenty years there has been increasing concern with the quality of the environment. Along with air and water pollutants, noise pollution has been recognized as a serious pollutant. As noise levels have risen, the effects of noise have become more obvious.

Noise is described as unwanted sound. Causes of noise pollution include traffic, aircraft, rock bands, barking dogs, television, garbage trucks, and noise from neighbors, voices, alarms and boats. Studies show that over forty percent of Americans are disturbed at home or lose sleep because of noise pollution.

Noise has bad effects on people. Noise interferes (干扰) with human activities at home and work, and is in various ways dangerous to people’s health and well-being.

When we think, talk, listen to music, or sleep, we need quiet. Even low levels of noise can be annoying or frustrating. Sudden increases in volume can make sounds annoying. The quieter the background is, the more unpleasant a noise can be.

Noise can also make instructions or warning unclear, resulting in accidents.

Long exposure to noise levels above eighty-five decibels (分贝) can damage inner ear cells and lead to hearing loss. Noise can result in the uncontrolled fear response and can cause adrenaline (肾上腺素) to be pumped into the bloodstream, the heart rate to quicken, muscles to tense, breathing to increase, and the digestive system to slow down.

Local government has the responsibility to fight noise pollution. For example, it can regulate the speed of trains through their community. On the other hand, ad responsible citizen will never make noise pollution wherever he is.

Title	【小题1】 Pollution
Definition   (定义)	【小题2】 regarded as noise.
【小题3】	Traffic, aircraft, rock bands, barking dogs, television, garbage trucks, and noise from neighbors, voices, alarms and boats.
Bad 【小题4】	●Disturbing 【小题5】 at home and work.	·When we think, talk, listen to music, or sleep, even low levels of noise can be 【小题6】. ·Accidents may 【小题7】 when noise makes instructions and warning unclear.
	●Being dangerous to people’s health and well-being	·Long exposure to loud noise can lead to 【小题8】 ·Noise can result in the uncontrolled fear response.
【小题9】 to deal with noise pollution	●【小题10】: regulate the speed of trains through their community. ●Citizens: never make noise pollution.