Theses and Dissertations

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Browsing Theses and Dissertations by Subject "Air quality"

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    ItemOpen Access
    Assessment and modeling of air quality in quarry sites in Abia State
    (Federal University of Technology, Owerri, 2023-10) Arua, Okechukwu Nwankwo
    This study focused on the assessment and modeling of air quality in selected quarry sites located in Lokpaukwu, Umunneochi Local Government Area of Abia State. Ambient air samples were taken in the major activities areas of the quarry site, such as the generator house, the weight bridge, the primary crusher, the secondary crusher, the administration block and the site main gate. The data obtained were subjected to statistical analysis. The study revealed a positive correlation between the observed and predicted pollutants concentration. It also shows the concentration of the pollutants between the model calculation and the actual monitoring are basically consistent. From the results the error of estimate gotten is within the specific range of statistical analysis. Eluama quarry site recorded 120.28𝑢𝑔/𝑚3 as the highest predicted concentration in the month of January, 2015 and 54.07𝑢𝑔/𝑚3 as the lowest predicted concentration in the month of May, 2015. Eziama quarry site recorded 104.22𝑢𝑔/𝑚3 as the highest predicted concentration in the month of March, 2015 and 59.05𝑢𝑔/𝑚3 as the lowest predicted concentration in the month of July, 2015. The result shows that the level of concentration of the particulates in air will be highest during the dry season and lowest during the rainy season or weather. It is therefore wise to say that the concentrations of the particulates will be severer during the dry season than the rainy seasons. Thus, suppression of dust must be effectively monitored during the dry season. From the predicted pollutants concentration, the two communities will be safe from the adverse effects of the pollutants, as the highest predicted concentration of the pollutants recorded is 120.28𝑢𝑔/𝑚3 which is below the permissible limits of NESREA and WHO (150𝑢𝑔/𝑚3𝑎𝑛𝑑 250𝑢𝑔/𝑚3 ). Also Concentrations decrease rapidly on moving away from the source, due to dispersion and dilution, which means there will be more reduction in concentration of the pollutants before it reaches the host communities. Overall, the model performance is satisfactory and this would provide reliable results in predicting or determining the air quality in Quarry Sites.
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    ItemOpen Access
    Spatiotemporal assessment of air quality in selected LGA in Rivers State
    (Federal University of Technology, Owerri, 2019-12) Ukaegbu, Kingsley Ogochukwu Emmanuel
    The pollution of ambient air has long been revealed as the most fatal form of environmental pollution. The levels of air pollution vary from one location to another and from time to time. The aim of the study is to assess the spatiotemporal distribution of air pollutants in selected LGAs in Rivers State. Nine points in the study area were sampled within two peak-periods (8.00 am and 4.00 pm), based on high industrial clusters, high vehicular traffic, and rising human population density. The concentrations of PM2.5, PM10, CO, SO2, and NO2 were measured using a handheld gas analyzer. A handheld Germin-300 GPS device was used to record the GPS coordinates of the sampling points which aided the data processing, to develop spatial interpolation maps in ArcMap. The results of air quality parameters were above the WHO and FMEnv air quality standards. PM 2.5 and PM10 have a maximum value of 159.23 and 378.39 respectively which is higher than the WHO and FMEnv Standard limits for 24 hours exposure. The recorded exceedance is 68.5ppb, 28.7ppb and 113.7ppb for SO2, NO2, and CO respectively, in the wet season. 71.1ppb, 15.31ppb and 58.9 ppb for SO2, NO2, and CO respectively in the dry season, are higher than WHO and FMEnv limited. Based on these, it is recommended that the populace of Port Harcourt city should limit their exposure especially in the dry season.