title: [Preventive effects of sound insulation windows on the indoor noise levels in a street residential building in Beijing].
abstract: OBJECTIVE
  To evaluate the preventive effects of sound insulation windows on traffic noise.
  
  
  METHODS
  Indoor noise levels of the residential rooms (on both the North 4th ring road side and the campus side) with closed sound insulation windows were measured using the sound level meter, and comparisons with the simultaneously measured outdoor noise levels were made. In addition, differences of indoor noise levels between rooms with closed sound insulation windows and open sound insulation windows were also compared.
  
  
  RESULTS
  The average outdoor noise levels of the North 4th ring road was higher than 70 dB(A), which exceeded the limitation stated in the "Environmental Quality Standard for Noise" (GB 3096-2008) in our country. However, with the sound insulation windows closed, the indoor noise levels reduced significantly to the level under 35 dB(A) (P<0.05), which complied with the indoor noise level standards in our country. The closed or open states of the sound insulation windows had significant influence on the indoor noise levels (P<0.05). Compared with the open state of the sound insulation window, when the sound insulation windows were closed, the indoor noise levels reduced 18.8 dB(A) and 8.3 dB(A) in residential rooms facing North 4th ring road side and campus side, respectively. The results indicated that installation of insulation windows had significant noise reduction effects on street residential buildings especially on the rooms facing major traffic roads.
  
  
  CONCLUSIONS
  Installation of the sound insulation windows has significant preventive effects on indoor noise in the street residential building.
authors.affiliation: Department of Occupational and Environmental Health Sciences, Peking University School of Public Health, Beijing 100191, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Guo
authors.affiliation: Department of Occupational and Environmental Health Sciences, Peking University School of Public Health, Beijing 100191, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Huang
authors.affiliation: Department of Occupational and Environmental Health Sciences, Peking University School of Public Health, Beijing 100191, China.
authors.forename: Xin-biao
authors.initials: XB
authors.lastname: Guo
mesh_terms: D002681:China; D003252:Construction Materials; D006798:Housing; D009622:Noise / Q000517:prevention & control*