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Ambient Air Quality Monitoring in Metropolitan City of Lagos, Nigeria
NJOKU, KELECHI LONGINUS; RUMIDE, TOSIN JOHN; AKINOLA, MODUPE OLATUNDE; ADESUYI, ADEOLA ALEX & JOLAOSO, ANUOLUWAPO OMOSILEOLA
Abstract
Twenty one sampling locations were assessed for carbon monoxide (CO),
carbondioxide (CO2), oxygen (O2), sulphur dioxide (SO2), nitrogen dioxide (NO2), nitrogen oxide
(NO), suspended particulate matter (SPM) and noise level using air pollutants measurement
methods approved by ASTM for each specific parameter. All equipments and meters were all
properly pre-calibrated before each usage for quality assurance. Findings of the study showed that
measured levels of noise (61.4 - 101.4 dBA), NO (0.0 - 3.0 ppm), NO2 (0.0 - 3.0 ppm), CO (1.0 –
42.0 ppm) and SPM (0.14 – 4.82 ppm) in all sampling areas were quite high and above regulatory
limits however there was no significant difference except in SPM (at all the sampling points), and
noise, NO2 and NO (only in major traffic intersection). Air quality index (AQI) indicates that the
ambient air can be described as poor for SPM, varied from good to very poor for CO, while NO
and NO2 are very good except at major traffic intersection where they were both poor and very
poor (D-E). The results suggest that strict and appropriate vehicle emission management,
industrial air pollution control coupled with close burning management of wastes should be
considered in the study area to reduce the risks associated with these pollutants.
Keywords
Air; Air quality index; sulphur-dioxide; pollutants; carbon-monoxide
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