AU - Hamidi, M AU - Kavousi, A AU - Nasiri, P AU - Hamedani, A AU - Kiani, S AU - Dehghan, H.R TI - Study of Noise Pollution in Urban and the Suburbs Railway PT - JOURNAL ARTICLE TA - IOH JN - IOH VO - 9 VI - 2 IP - 2 4099 - http://ioh.iums.ac.ir/article-1-852-en.html 4100 - http://ioh.iums.ac.ir/article-1-852-en.pdf SO - IOH 2 AB  -   Background and aims: Noise pollution is one of the risk factors of the human environment that may seriously threat physical and mental health of human beings. One of the main sources of this type of pollution is the noise produced by urban transportation and traffic, particularly subway in the environment. This article aims at study and evaluation of the noise condition in drivers’ cabin and inside wagons of the subway of Tehran and the suburbs.   Methods: Noise level and noise frequency analysis in the trains of lines one, two, four and five of the subway which are among the active lines of Tehran subway and the suburbs have been measured and evaluated at 345 points within one week over two days while the train was moving and stopped of which 96 points were located inside the driver’s cabin and 258 points were in wagons. Noise was evaluated based on Free Air Standard approved by the Environment Higher Council of Iran and ACGIH Organization. The subway trains were also compared regarding noise pollution based on type of the train (TM, DC, AC ). Calibrated analyzer instrument, model CEL-450/490 was used to measure noise and the data were analyzed by statistical descriptive methods, t-test and analysis of variance by SPSS18 software.   Results: Mean equivalent noise level measured in the moving wagon was equal to 71.9 dBA that is significantly higher than the standard level (65 dBA) ( P CP - IRAN IN - LG - eng PB - IOH PG - 76 PT - Research YR - 2012