title: Assessment of traffic noise pollution from 1989 to 2003 in Lanzhou City.
abstract: On the basis of the continuous traffic noise data observed at 142 sites distributed in 52 roads from 1989 to 2003, the characteristics of traffic noise and effect factors were analyzed through traffic noise indices, such as Lep, L10, L50, L90, TNI, and Pn. Our findings allow us to reach a number of conclusions as follows: Firstly, traffic noise pollution was serious, and its fluctuant characteristic was obvious, resulting in a great intrusion to public in Lanzhou City during last 15 years. Secondly, traffic noise made a distinction between trunk lines and secondary lines, west-east direction roads and north-south direction roads. Thirdly, spatial character and time rule of traffic noise were obvious. In addition, traffic volume, traffic composition, road condition, and traffic management were identified as the key factors influencing traffic noise in this city.
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sources, China.
authors.forename: Guoxia
authors.initials: G
authors.lastname: Ma
authors.forename: Yujun
authors.initials: Y
authors.lastname: Tian
authors.forename: Tianzhen
authors.initials: T
authors.lastname: Ju
authors.forename: Zhengwu
authors.initials: Z
authors.lastname: Ren
mesh_terms: D002681:China; D002947:Cities; D004781:Environmental Exposure / Q000266:history*; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D018986:Motor Vehicles; D009624:Noise, Transportation / Q000706:statistics & numerical data*