title: [Measurement and analysis of personal noise exposure in a city metro].
abstract: OBJECTIVE
  To measure and analyze the personal noise exposure of city metro station workers by using noise dosimeter.
  
  
  METHODS
  According to job category and work type, all workers were divided into 4 groups. The workers from each group were selected as subjects for personal noise exposure measurement. CEL-320 dosimeters were worn by each subject and noise data collected by a phone fixed at collar. All subjects were asked to take notes about their working activities when they were wearing CEL-320 dosimeters. Each worker's one workday LAeq, geometric mean and range of each group were computed.
  
  
  RESULTS
  There were many noise sources in the metro station, and the noise exposure was unstable. The varieties of personal noise levels were recorded among 48 workers, the highest LAeq work type was of the instrument room, (81.8 +/- 2.5) dB (A), and the biggest LAeq rang was of the hall, 8.1 dB (A). The lowest LAeq was of the station control room (68.7 +/- 1.8) dB (A) and the lowest LAeq rang also was there, 4.0 dB (A).
  
  
  CONCLUSIONS
  The personal noise exposure of metro station should be implicated. Measuring personal noise exposure individually with dosimeters might obtain the noise exposure level more integrally in the complicated environment.
authors.affiliation: Guangzhou Occupational Disease Preventive and Treatment Center, Guangzhou 510620, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhu
authors.forename: Hui
authors.initials: H
authors.lastname: Zuo
authors.forename: Wei-jia
authors.initials: WJ
authors.lastname: Du
authors.forename: Yi-min
authors.initials: YM
authors.lastname: Liu
mesh_terms: D006801:Humans; D009623:Noise, Occupational / Q000706:statistics & numerical data*; D016273:Occupational Exposure / Q000032:analysis / Q000706:statistics & numerical data*; D011890:Railroads; D014505:Urban Population