Analysis on spectrum characteristics of high-intensity noise in key industries in Guangdong Province
Objective To analyze the spectrum distribution characteristics of high-intensity productive noise in key industries in Guangdong Province.Methods A total of 2 806 enterprises in 21 prefecture-level cities in Guangdong Province were selected as the study subjects using the stratified sampling method.On-site investigations were conducted in workplaces.Noise in workplaces and work-sites,and the noise spectrum of the workplaces with sound pressure level ≥85.0 dB(A)were detected.Results The noise of a total of 23 076 workplaces and 20 969 work sites from 30 key industries were monitored.The median(M)and 25th and 75th percentiles(P25,P75)of workplace sound pressure level were 82.3(78.6,86.5)dB(A).The rate of the noise exceeded national standard was 30.4％.The sound pressure level M(P25,P75)of work-site was 78.6(70.0,83.5)dB(A).The rate of the noise exceeded national standard was 18.0％.Workplace noise and work site noise were positively correlated(Spearman correlation coefficient=0.86,P＜0.01).The rate of the noise exceeded national standard was 46.5％in key work sites where the rate of noise exceeded the national standard was ≥25.0％,and corresponding rate of the workplace noise exceeded national standard was 58.1％.The noise spectrum result of 5 636 workplaces sound pressure level＞85.0 dB(A)showed that most of the noise source was from grinding machines(441 cases),and the highest average sound pre(s)sure level of noise source was from screening machines[93.0 dB(A)].Cluster analysis results showed that the main noise sources could be divided into three categories,including wideband noise with levels＞80.0 dB in all frequency bands except 8 000.0 Hz,medium-high-frequency noise with the highest sound pressure level at 1 000.0,2 000.0,and 4 000.0 Hz and low frequencies＜75.0 dB,and medium-low-frequency noise below 500.0 Hz with sound pressure level＞85.0 dB.Conclusion The rate of the noise exceeded national standard in workplace of key industries in Guangdong Province is high,involving a wide range of industries,with high sound pressure levels and obvious spectrum characteristics of corresponding noise sources.Corresponding noise control strategies can be formulated based on different spectrum characteristics and magnitudes.
Key industriesNoiseCharacteristicsSpectrumHigh intensityWorkplaceWork site
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