SEASONAL VARIATION OF TOTAL OXIDANTS: CONTRIBUTIONS OF OXIDES OF NITROGEN, SULPHUR (IV) OXIDE EMISSIONS AND BACKGROUND OZONE FROM ILORIN, NIGERIA

Abstract

The model runs with single point source showing the variation of concentrations of air pollutants (NO2, NOx, O3, and SO2) with distance in ambient air of Ilorin. This city is a medium size town, located in the central guinea savannah zone of Nigeria. The model runs was done using data collected during dry and wet seasons using Air Dispersion Modeling System (ADMS) – Urban. The pattern of NO2 and NOx are different at the two seasons, a Gaussian type curve was observed during dry season while a Sigmoid curve obtained during the wet season. However, the elevation was higher for dry than wet season due to higher photochemical activities. The results obtained in ppb are: NOx 10.48, SO2 6.82, O3 60.28; wet; NOx 3.12, SO2 5.32,O3 15.72. These predicted concentration values from theoretical model compared fairly well with the measured values and empirical model values.