Zahra Chabi Ahwazi - M.S student of Environnental Engineering , Air pollution, Khouzestan Aciences and Wesearches Branch,Islamic Azad University, Ahvaz, Iran
Elahe Zallaghi - M.S,Young Researchers and Elite Club, Khouzestan Sciences and Researches Branch, Islamic Azad University, Ahvaz, Iran Environmental pollutions
Muhammad Reza Monnazam Esmail pour - Associate professor of Department of Professional Health Engineering.
Muhammad Sadegh Sekhavat-jou - Assisstant professor of Department of Environmental Engineering- Air pollution.

Introduction: Among the environmental pollutions, noise polluion, due to the potential physiological and psychplpgical effects on humans, is of a particular importance. One of the most important sources of the pollution is transportation and cars traffic. the present study was implemented in 2011 with an overall goal of assessment of noise pollution fromtraffic in crowded highways of Ahwaz, Iran. Methods and Materials: In this descriptive study, 7 roads of the main routs of Ahwaz which have high density of traffic are selected and 112 measuring stations were chosen. In them, at measuring stations, on 4 days of week, at three time periods totally 1344 measurments were recorded that including 6 parameters of traffic nois (Lmax , Lmin , Leq , L10 , L50 , L90 ) and each measurement was recorded for 30 minutes. After transferring datas to computer, Spss and Excel softwares were applied for statistical analysis and T-test and ANOVA were used for statistical tests. Results: The findings of this study showed, that average of equivalent Sound pressure level in all stations is equal to 72/62±2/53. There was a Statistically Significant difference between the mean Values of equivalent Sound Pressure level on different roads, different weekdays and Various daytimes jointly and (P<0.05). Also the results showed that average Values of L10 , L50 , L90 were 77.20 ±1/50 , 72.12±2.15 and 68.80±1/62 dBA results, it was found that Ahwaz has a higher noise pollution in comparison with outdoor permissible limit standard in Iran. So, It should seriously be taken into consideration in order to control noise and prevent the effects.

Noise pollution, Noise Index, Traffic, Ahwaz