noise pollution
During the last twenty years there has been increasing concern with the quality of the environment. Along with air and water contaminants, noise pollution has been recognized as a serious pollutant. As noise levels have risen, the effects of noise have become more apparent. Noise is defined as "unwanted sound". Noise has adverse effects on people and the environment. Noise causes hearing loss, interferes with human activities at home and work, and is in various ways dangerous to people's health and well being. Studies show that over forty percent of Americans are disturbed at home or lose sleep because of noise pollution. Causes of noise pollution include traffic, aircraft, rock bands, barking dogs, amplified music, television, garbage trucks, and noise from neighbors, voices, alarms, and watercrafts. Annoyance: 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 - this is why sirens are so intrusive. The quieter the background, the more penetrating a noise can be. Natural sounds are
(Portable air compressors, rear mounted garbage compactors). Local government can, however, regulate the speed of trains through their community and regulate the sounding of whistles when an electronic crossing is available. Noise can also make instructions or warning unclear, resulting in accidents. Louder noise bursts can be more disruptive. Continued stress can lead to hypertension, which is the major cause of strokes and cardiovascular diseases. Aggravation of heart and circulatory diseases: Noise can trigger the involuntary fear response and can cause adrenaline to be pumped into the bloodstream, blood vessels to constrict, the heart rate to quicken, muscles to tense, breathing to increase, and the digestive system to slow down. Examples of Noise Exposure of Individuals' 24-Hour Average Sound Level, Decibels Individual Urban Environ. All commercial jet engines must meet noise emission criteria prior to being certified for flight. Hearing loss: Prolonged exposure to noise levels above eighty-five decibels can damage inner ear cells and lead to hearing loss. In addition, the regulations change with noise intensity and time worked. Speech interference: Noise can interfere with speech. Complex tasks are more likely to be impaired. Noise is more likely to reduce the accuracy of the work than the total quantity of work done. Any more than that will cause a problem.
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