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标题：Evaluation of the equivalent level in the case of traffic noise in Isfahan, Iran
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作者：Minoo Moshtaghi ; Hadi Radnezhad ; Masoumeh Sadeghi 等
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2015
卷号：6
期号：10
页码：2703-2710
出版社：University of Mohammed Premier Oujda
摘要：Traffic noise is considered as one of the important sources of noise pollution in urban areas. Day-time urbannoise quality assessment was studied in Chaharbagh Bala Street in Isfahan that has the combination of criticalzones, therapeutic, educational, commercial, residential and touristic. The aim of this study is to determine theequivalent noise level (LAeq30) by metric Castle 450 made in the England. Since the chosen square is a clearhotspot for traffic noise in a large city, the measurements of equivalent level noise in this street performed at 8stations leading to Azadi Square in order to obtain a 12-h noise level. intersections of Hezarjerieb, Shariati, Polhotel and Nazar (in 2 lanes of north and south or east and west) at 8-12 of morning and 17-21 of evening with 3replications on weekdays and! compared with standard 60 dB. The volume of traffic was also quantified byreproducing video camera recordings. The highest mean Leq of 83.67 dBA was observed in Hezarjeribeducational- residential- commercial zone followed by, 79.47 dBA in Shariati residential- hospital zone atmorning, 77.48 dBA in Nazar residential- commercial zone and the minimum was 62.18 dBA in Pol hotelresidential- touristic- commercial-zone at evening. All observed Leqs were above the statutory limits that is 60dB. In addition, measurements in the timeframe of 30 minutes showed that the rate of travel of the vehicle isvery high. The noise measurement clearly indicated the alarming condition of noise pollution.
关键词：Critical zones; Equivalent noise level; Traffic noise; and 12;h noise level