BELAY SITOTAW*#, E. MENGISTU*, S. ZERIHUN*, H. MAMO**
*Department of Physics, Dire Dawa University, Ethiopia
**Department of Biology, Dire Dawa University, Ethiopia
The road traffic is one of the main sources of noise pollution in the urban area. The main purpose of this study was to measure the ambient noise fluctuation levels in five selected sites of Dire Dawa city. The study reports traffic noise fluctuations during the day and night since the city is an industrial corridor and it is used as a dry port for the country. The noise level was measured after the standard measure followed by standard calibrated devices. The variations of the equivalent noise levels were represented in figures and the total annoyance of the noise levels was calculated and shown in Table 1. The results revealed that the highest annoyance and the equivalent noise levels at Delchora hospitals were 83.15 dB and 85.20 dB respectively in the morning. However, the noise pollution level (LNP) at Delchora Hospital during the morning is greater than in the afternoon. The minimum noise levels were measured in the residence of MA hotel 24.77 dB with the standard deviation of 0.10 in the morning time interval.
Key words: Equivalent noise, noise levels, decibels, LNP, traffic noise.
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