Evaluation of noise pollution in ditrict 14 of Tehran

The main source of noise pollution in urban areas is transportation systems. In order to evaluate the level of traffic noise، one of the most populated regions of Tehran، District 14، is chosen. The main reason to choose this area is that there exist a local subways and populated roads like Pirouzi and 17 Shahrivar in this region. In order to illustrate the changes of noise levels، 6 stations in different days of week and various time spans were measured. The result of this stage showed that noise levels during different days of week and different time span during each day and also between three measured noise variables، and doesn’t show a significant statistical difference. But there is significant noise level differences between working days and weakened. Then in the next stage، 91 stations in the specified region were chosen and the noise rate in different weekdays from Saturday to Wednesday in three day times including morning (7-9 AM) noon (12-3 PM) and night (5-8 PM) is measured for each station. Based on the results of this research maximum noise equivalent level () is equivalent to 84. 2 dB (A) related to Basij highway، in front of Ghasre Firozeh that is an important highway in the area. And the least ten minutes noise equivalent level is equal to 59. 9 dB (A) related to Fajr hospital station. Average equivalent noise levels at all stations were compared with the standard recommended by Iran Department of Environment and in all stations noise levels were higher than that of the standard level. Finally some solutions for decreasing noise pollution are suggested. One of these solutions is using noise barriers in Basij high way، widening the streets of 17Shahrivar، Pirouzi and Khavaran. The related zones are located and shown on the map.