Analysis and evaluation of noise pollution in Karaj city

Subject Areas : nosie

MAHSA ADL ^{1 *} , Leila Mahmoudi ² , Shima Azizi ³ , Amin Taherianfar ⁴

1 - ‌Manager of Environmental Management Group, Environment & Sustainable development Deputy, MOSHANIR * (Corresponding Author)
2 - Environmental Expert, Environment & Sustainable development Deputy, MOSHANIR.
3 - GIS Expert, Environment & Sustainable development Deputy, MOSHANIR.
4 - ‌Manager of project control & planning group, Environment & Sustainable development Deputy, MOSHANIR.

Received: 2021-11-09 Accepted : 2022-02-05 Published : 2022-12-22

Keywords: equivalent sound level, Geographic Information System (GIS), City, Noise pollution,

Abstract :

Background and Objective: In this paper, after examining the situation of noise pollution in the city of Karaj, priority areas have been identified to be the target of proper planning and management in terms of noise pollution control in the future (online monitoring sysytems ….). Material and Methodology: In the present study, after detailed identification of noise pollution sources in Karaj and considering the time and financial constraints of the project 108 noise monitoring stations with morning, noon and night frequencies in three seasons of autumn and winter 99 and spring 1400 to investigate noise pollution and the equivalent sound level of Karaj was selected. After analyzing the results and data of sound measurement in SPSS and Excel software and their statistical description, zoning maps of equivalent sound level in Karaj city by IDW interpolation (distance based weighting) method with the help of software GIS software was provided.     Findings: Comparing the results of Karaj city with the Iranian sound standard showed that 90% of the equivalent sound level is higher than the residential standard, 84% higher than the residential-commercial standard, 70% higher than the commercial standard, 52% higher than the commercial-industrial standard. And is 31% higher than the industry standard. Karaj sound level zoning also showed that regions 1, 8 and 9 have the highest noise pollution and regions 3, 4, 6 and 7 face the lowest noise pollution. Discussion and Conclusion: The present study shows the increasing trend of noise pollution in Karaj, especially in some areas, the need for systematic and continuous monitoring of noise pollution, conducting more detailed studies and more comprehensive studies of noise pollution (characteristics, seasonal fluctuations, Noise pollution boundaries, etc.), Setting up and establishing online voice monitoring systems, using fences and sound barriers should be on the agenda.

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