Hadi Negahdari - Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
Sirus Javadpour - Material Science and Engineering Department, School of Engineering, Shiraz University, Shiraz, Iran
Faramarz Moattar - Department of Civil Engineering, School of Engineering, Islamic Azad University, Shiraz Branch, Shiraz, Iran
Hashem Negahdari

Background: Today, the effects of environmental pollution on human life and human needs, whichreduces the level of community health caused by traffic noise in large cities, are clearly visible by creatingirritation and pathogenic conditions. The aim of this study was to assess the risk of noise pollutionresulted from central traffic in Shiraz by analyzing its indicators and related components.Methods: By specifying the high traffic jam in Shiraz, the sound and its frequency in 156 points of thecity were analyzed using a sound analyzer (Tes-1358C model). The sound pressure levels (LA and LP)and the one and one-third octave band were continuously measured in A and C networks. Then, datawere extracted and analyzed using Excel 2016 and Minitab 18.1. Eventually, phon and sone indexeswere calculated for the heavy traffic jam in some of the central streets of Shiraz and the results werestatistically calculated and their charts were prepared with comfort disturbance ranges.Results: The highest harmful frequency of traffic in Shiraz was 50 Hz and 83.3 dB. The sound pressurelevel ranged from 70 to 92.7 dB in network A and 87.8 dB in network C. The maximum sound level was87 phon and the maximum sone was 26 at 14 stations.Conclusion: According to the results, the sound pressure levels exceeded the environmental standardsof Iran and the values of phon and sone were higher than the standard of comfort at night and day.

Noise pollution, Environmental pollution, Loudness perception, Health risk assessment, Shiraz