Investigation into the Effects of Environmental Noise on the Health of Population Living Around Coal Mines
煤矿环境噪声对居民健康影响的调查

o refer to PRC' S standard for environmentalnoise, two groups of population which exposed tothe noise above 50 dB (A) and below 50 dB (A)were selected from Guandi coal mine in westernmountain region, Taiyuan, and 256 men above 16years old were taken as the investigative subjects inthis study. The results of measurement were that thegreatest values of environmental noise measuredoutdoor and indoor were 75 dB(A) and 63 dB(A),respectively. All of these values have exceeded thePRC's standard for environmental noise.Therefore, the results shown that living, workingand studing under this condition have injuried effectson population's nerve system and hearing to acerium extent and the injury extent was associatedclosely with living-years. The possitive rate ofneurasthenis in population living for above 10 yearsand exposed to above 50 dB (A) was 34. 28%,while that exposed to below 50 dB (A) was 13.35%, the hearing injury of voice frequency inpopulation living for above 10 years and exposed to50 dB(A) was 34. 7% while that living for below10 years was 29. 59% and there were statisticallysignificant differences between both above at P<0.05.