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Evaluation of Vehicular Noise Pollution in Onitsha Metropolis, Nigeria

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Document pages: 12 pages

Abstract: Noise pollution, a by-product of urbanization and industrialization, is widely recognized as a major problem for the quality of city life. The 10 selected areas of study are 2 commercial centres, 2 road junctions busy roads, 2 passenger loading parks and 2 high-density and 2 low density residential areas. Noise measurements are done in the morning ( – 9.00am), at noon (11.00 – 12.00pm), during afternoon (2.00pm – 3.00pm) and in the evening (5.00pm – 6.00pm); to determine noise pollution all over the metropolis. Noise descriptors such as L10, L50, L90, LAeq, TNI, NPL (LNP) and NC were assessed to reveal the extent of noise pollution due to heavy traffic and failures of some mechanical systems in the metropolis. The road junctions had the highest noise pollution levels, followed by commercial centers, passenger loading parks, high density residential area and finally low density residential area. Noise threshold were found to be much beyond the permissible limit (70dB during the day time).Comparison of predicted equivalent noise level with that of the actual measured data showed that the model used for the prediction has the ability to calibrate the multi-component traffic noise and yield reliable result close to that by direct measurement.

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