Abstract
The level of noise exposure to daily road side traders at five major roundabouts in Ibadan metropolis was assessed. Noise measurements were made using a precision multi-function sound level meter. Measurements were made at three different periods of the day; morning (7:30 to 11:30 a.m.), afternoon (12:00 to 3:00 p.m.) and evening (4:00 to 5.00 p.m.) for a consecutive period of ten days. The highest mean maximum noise levels of 87.19 dBA (evening), 87.14 dBA (morning) and 87.35 dBA (afternoon) were obtained at Ojo, Iwo road and Dugbe roundabouts respectively while all the lowest mean minimum noise level for the periods of measurements were obtained at Sango roundabout. The results obtained were within the safe recommended 90 dBA for an 8 h exposure noise level by Occupational Safety and Health Administration. However, longer periods beyond 8 h may portend deleterious acoustic effects to these traders given the peculiar nature of the daily road side business activities and also being close to sources of noise from vehicles at these roundabouts Key words: Noise exposure level, roundabout, noise health effects, road side petty traders.
Highlights
Noise may be defined as an unwanted sound emitted from different sources which is unpleasant to human hearing
The measured noise level at the five roundabouts (Sango market, Ojoo market, Iwo road market, Dugbe market and Challenge market) during the morning hours (7:30 to 11:30 a.m.), afternoon (12:00 to 3:00 p.m.) and evening hours (4:00 to 5:00 p.m) for consecutive period of ten days are presented in Tables 1 -5
The mean maximum noise levels and mean minimum noise levels for each roundabout are presented in Figures 1- 5
Summary
Noise may be defined as an unwanted sound emitted from different sources which is unpleasant to human hearing. In Ibadan metropolis, noise pollution is a common environmental problem (Maduemezia, 2002). The negative effects of noise pollution are multifarious to human health. These include annoyance, insomnia, low productivity at work, permanent ringing or buzzing in the ears (tinnitus), sleep disturbance and fatigue, psychological stress and stress related disease, psychological changes in heart beat and increased blood pressure (Dawal et al, 2007; Akinkuade and Fasae, 2015). The most conspicuous effect of noise pollution is damage to human hearing ability which may be temporary or permanent depending on the exposure time
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