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Characterization of Airborne Fine Particulate Matter (PM2.5) and Its Air Quality Implications in Ogun State, Nigeria

Anake, W. U. and Benson, N. U. and Ana, Godson R.E.E (2016) Characterization of Airborne Fine Particulate Matter (PM2.5) and Its Air Quality Implications in Ogun State, Nigeria. In: 3rd International Conference On African Development Issues (CU-ICADI), May 9- May 11 2016, Covenant University, Ota, Nigeria.

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Abstract

Atmospheric aerosols pose a serious threat to environmental quality and health of the public. Several studies in Nigeria have documented the pollution levels from coarse particles but very few have elucidated the nature of the fine particles in the context of air quality index. Our investigation therefore focused on air quality index in relation to ambient fine particulate and composition of PM2.5 collected from an industrial area (IA) and a university community (UC) in Ogun State, Nigeria. The PM2.5 samples were collected using Environtech gravimetric sampler according to standard methods. The morphology and elemental composition of PM2.5 were assessed by scanning electron microscope (SEM) coupled with an energy dispersive X-ray (EDX). The SEM images of fine particles indicated the following clustered groups: soot particles, alumino silicates, and mixture of alumino silicate with soot. Energy dispersive X-ray spectra showed nine most abundant elemental composition in all samples. Possible source emissions of elements identified by principal component analysis are industrial processes, vehicle emissions, crustal dust, fuel-oil and biomass burning. Air quality index (AQI), for particulate pollution was calculated for each location. Fine particle pollution indices scaled from 51 to 500, reflecting six out of the seven AQI categories in varying proportions. The absence of 0 to 50 gradation representing the good AQI category is conspicuously highlighted. Results indicate that most AQI values were above 100. Possible adverse health concerns mostly for the vulnerable populations are indicated considering the unhealthy air quality state of studied locations.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: PM2.5 pollution; elemental composition; SEM-EDX; air quality index
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User: Ms Ugwunwa Esse
Date Deposited: 29 Jun 2016 15:45
Last Modified: 29 Jun 2016 15:45
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/6701

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