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噪声是多种音调成分的无规律的复合声,是干扰人们休息、工作、学习等不协调的声音。现在北京市交边噪声平均超过70分贝的地区有67.4%;上海闹市区噪声达92分贝。纽约市经常接触噪声达85分贝的居民至少有1,000万人。北京等九省市噪声调研协作组报告:噪声作业工人患神经衰弱症候群阳性率为24.55%,而且窦性心律不齐,心电图ST—T段呈缺血型改变等均比无噪声接
Noise is a complex compound of a variety of tonal components, which is a dissonant voice that interferes with people’s rest, work and study. Nowadays, the noise in Beijing is over 67.4% in areas where the noise is more than 70dB on average; the noise in downtown Shanghai reaches 92dB. New York City has at least 10 million inhabitants regularly exposed to noise up to 85 decibels. Beijing and other provinces and cities Noise Research Collaboration Group report: noise workers suffering from neurasthenia syndrome positive rate was 24.55%, and sinus arrhythmia, ECG ST-T segments were ischemic changes than non-noise