Abstract
Evaluation and analysis of noise pollution in Ilorin metropolis have been carried out. A statistical analysis of the day-time noise levels (LD) and night-time noise levels (LN) in 42-locations shows no significant different (p>0.05) at busy roads/road junctions, commercial centers and high density residential areas, but there is significant different (p< 0.05) at passengers loading parks and low density residential areas. The highest day-time (LD) and night-time (LN) noise levels were 89 dB(A) at Challenge junction and 85 dB(A) at Emir`s road, respectively. The lowest day-time (LD) and night-time (LN) noise levels were 43 dB(A) at Basin and 44 dB(A) at Airport, respectively. The noise levels in Ilorin city exceeded allowed values by the WHO at 37 of 42 measurement points. At 95% confidence level, test for significant difference of the means and variances of the day-time noise levels and night-time noise levels shows no difference in all the locations surveyed. At 90% confidence level, analysis of variance for two factor experiment using F-distribution (carried out on the noise descriptors L 10 and L90) shows that noise exposure level differs significantly from one location to another.
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