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作者测量了开罗不同地方(主要街道、广场、桥上和铁路公路交叉口等)的道路交通噪声,噪声强度范围为72～110dB(A),司机鸣喇叭时测量的强度最高值是在铁路公路交叉路口,测试了126名交通警察和50名对照组(内勤警察)的纯音听阈。交通警察及对照组的平均年龄分别为47.2±6.0和和48.7±6.6岁,平均工龄为20.8±5.6(范围9～36年)和22.1±8.2年(范围11～38年),两组人员的工作时间均为每周6日,每日7小时。纯音听阈测试频率为0.25、0.5、1、2、4、
The author measures road traffic noise in different parts of Cairo (main streets, squares, bridges and railroad intersections, etc.) with a noise intensity range of 72-110 dB (A). The highest intensity measured when the driver is honking is on the railroad At the crossroads, pure tone thresholds were tested for 126 traffic policemen and 50 control police (ground police). The average age of the traffic police officers and the control group were 47.2 ± 6.0 and 48.7 ± 6.6 years, respectively, with an average length of service of 20.8 ± 5.6 (range, 9 to 36 years) and 22.1 ± 8.2 years (range, 11 to 38 years) Working hours are 6 days a week, 7 hours a day. Pure tone hearing threshold test frequency of 0.25,0.5,1,2,4,