ABSTRACT
A detailed method used for assessing and mapping noise pollution levels in Ota metropolis, Nigeria using ArcGIS 10.5 Software is presented in this paper. Noise readings were measured at a time interval of 30 min for each site considered using a precision grade sound level meter. The noise map developed was based on the computed values of average equivalent noise (LAeq) for the selected locations. Results of this study show that the A weighted sound level (LAeq), the background noise level (L10) and the peak noise level (L90) vary with location and period of the day due to traffic characteristics especially traffic volume, vehicle horns, vehicle mounted speakers, and unmuffled vehicles at road Junctions, major roads, motor parks and commercial centres. Based on the U.S. Department of Housing and Urban Development (HUD) recommendations and standards, only one (1) out of the 41 locations considered is under normally acceptable situation, while 12 locations are under normally unacceptable and the noise levels of the rest locations are clearly unacceptable. Results of this study are useful as reference and guideline for future planning and regulations on noise limit to be implemented for urban areas like Ota Metropolis. â¢Instrumentation used in this study for the environmental noise measurements consisted of a precision-grade sound-level meter - Model 8922 RS232.â¢The Geographical Positioning System (GPS) device (model: Magellan eXplorist 310) was used to obtain the exact coordinates of each location where noise level readings were recorded.â¢ArcGIS 10.5 software was used in this study to develop noise map for Ota Metropolis.
ABSTRACT
Datasets contained in this article are noise level measurement carried out at 41 different locations in Ota metropolis, Nigeria. The noise readings were measured at a time interval of 30â¯min for each site considered using a precision grade sound level meter. The analysis was based on the noise descriptors LAeq, L10, L90, LD, TNI and NEI. Results from the study reflects that the highest and lowest equivalent noise levels (LAeq) were recorded at commercial areas (96â¯dB (A)) and residential areas (52â¯dB (A)), respectively, the background noise level (L90) has the highest and lowest values at commercial areas (77â¯dB (A)) and residential areas (44â¯dB (A)), respectively and the peak value (L10) has the highest value and lowest value at the commercial areas (96â¯dB (A)) and residential areas (56â¯dB (A)). Based on the WHO recommendations and standards, only 2 out of the 41 locations considered are under normally acceptable situation while the noise levels of other areas are not acceptable. Noise map developed in this study provides enough information for technical controls and interim legislation against environmental noise pollution in the metropolis. Moreover, considering the noise emission standards, planning and promoting the citizens awareness about the high noise risk could help to mitigate the effect of noise in Ota, Metropolis. The noise data in this study are useful as reference and guideline for future regulations on noise limit to be implemented for urban areas in Nigeria and developing countries at large.
ABSTRACT
UNLABELLED: Abstract INTRODUCTION: Uncontrolled diabetes mellitus has been reported to lead to renal dysfunction. Quail egg consumption has been reported to exert curative effects in some disease conditions like diabetes mellitus, tuberculosis, and asthma. This study investigated the effects of quail egg consumption on some kidney functions in alloxan induced diabetic rats. METHODS: Forty male Wistar rats with an average weight of 170g were randomly divided into four groups. Groups A-Control, B-Diabetic untreated, C-Diabetic treated and D-Normal treated. Groups B and C were made diabetic with a single dose of alloxan monohydrate (100 mg/kg i.p). Raw quail egg was administered orally (5 ml/kg) to groups C and D for 14 days. Body weight and blood glucose were monitored during the study. Blood and kidney samples were obtained from animals in each group, and analyzed for total protein, creatinine, blood urea nitrogen (BUN), renal malondialdehyde (MDA) and superoxide dismutase (SOD). Data were analyzed using ANOVA at P < 0.05. RESULTS: Diabetic group treated with quail egg showed significant (P < 0.05) increase in SOD, decrease in body weight, blood glucose, total protein, creatinine, BUN and MDA levels when compared to diabetic untreated group. However, values of these parameters obtained from diabetic group treated with quail were comparable to control. CONCLUSION: Quail egg consumption significantly reduced hyperglycemia, serum total protein, creatinine, BUN, MDA and increased SOD activities in alloxan induced diabetic Wistar rats which suggests that it lowers blood glucose and ameliorates renal impairment in diabetes mellitus.