Geographic Information System Based Noise Study in Crowded Areas of Isfahan City in 2010-2011 Publisher



Jafari N¹ ; Abdolahnejad A¹ ; Ebrahimi A^{1, 2} ; Bina B^{1, 2} ; Mortezaie S³ Show Affiliations
Source: International Journal of Environmental Health Engineering Published:2015

Abstract

Aims: The aim of this study was to evaluate noise pollution levels (NPLs) in Isfahan, compare with guideline values and providing a zoning map. Materials and Methods: This study was a descriptive cross-sectional type. Totally, 19 stations were selected from most congested areas throughout the city. In determination of these stations, the Isfahan information maps of the city traffic (obtained from Isfahan traffic and transportation organization) were used. Noise parameters L10, L50, L90, L95, L99, equivalent sound level (Leq), sound exposure level, sound pressure level, Lmin, Lmax, and Lpeak were measured using a CEL-440 sound level meter for 3 months of winter 2010-2011. The NPL and traffic noise index were calculated by a mathematical formula. All measurements were carried out twice a day (morning [a.m.] and afternoon [p.m.]) with the time interval of 0.5 h. To prepare the zoning map of the measured Leq, ArcGIS software version 9.3 was used. Results: The mean and standard deviation of the measured Leq values in the a.m. and p.m. were 74.6 ± 2.78 and 72.6 ± 4.43 dB(A), respectively. In comparison, there was a significant difference between the average Leq values of a.m. and p.m. (P < 0.001) and both were higher than the noise guidelines suggested by Iranian environmental protection organization. The zoning maps show that the maximum Leq in the a.m. (78.3 dB(A)) was related to Ferdowsi bridge station and in the p.m. (79.6 dB(A)) was dedicated to Jomhoori square station. Conclusion: It can be concluded that as in the most cases the noise levels of Isfahan exceeded from the guideline values. This city is categorized in the noisy/crowded cities in Iran. Thus, noise pollution of Isfahan can be a serious problem and investigating its reasons is recommended. © 2015 Jafari N.