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唐山为重工业城市,现有机动车45019辆。车流量密度,高峰时八个主要路口为459～1174辆/小时。唐山市环境噪声据有关部门测定,交通噪声占41％,八个主要交通路口等效声级Leg为76.75dB(A),最大分贝值达99dB(A),车流量高峰时平均为90dB(A),超过了“城市环境噪声标准试(行)”的规定。交通警察作为严重暴露于环境噪声的人群组,1984年4月,我们采用国产7LJ—1型听力计,按《工业企业噪声卫生标准》(试行草案)所示的方法,对唐山市67名交通警察做了听力和阈上功能(DL试验)检
Tangshan heavy industry city, the existing motor vehicles 45019. Traffic flow density, the peak of the eight major junctions for the 459 ~ 1174 vehicles / hour. According to the relevant department’s determination, the traffic noise accounts for 41%. The equivalent sound level Leg of the eight main traffic junctions is 76.75dB (A), the maximum decibel value reaches 99dB (A), and the average traffic flow peak is 90dB (A ), Exceeding the “Urban Environmental Noise Standard Test (line)” requirement. Traffic police as a serious exposure to environmental noise groups, April 1984, we use domestic 7LJ-1-type audiometer, according to “Industrial Enterprise Noise Health Standards” (draft) shown in the method of Tangshan City, 67 Traffic police did hearing and threshold function (DL test) seized