Monitoring of sulfur dioxide in the guinea savanna zone of Nigeria: implications of the atmospheric photochemistry

Abstract

The level of sulfur(IV) oxide (SO2) in the tropospheric environment of Ilorin is presented using three urban classes and a control site from 2003-2006 wet and dry seasons. The mean concentrations over the years during wet and dry seasons were 1.29 ± 0.17 and 7.17 ± 0.87 (ppb), respectively. The wet season concentration was 15.25% lower than the dry season due to rain attenuation. The mean values at the control site for two seasons were one order of magnitude lower than those in the urban sites. The overall average concentration over Ilorin city was 4.23 ± 0.52 ppb. The value is comparable with other cities of the world and is within the limit of the United State Environmental Protection Agency (USEPA) Guidelines for Air Quality Standards. SO2 levels were found to varied significantly with vehicular intensity, other anthropogenic activities also decreased drastically during wet season. There was a significant difference (p = 0.05) between SO2 concentration with high and low traffic flow count; however, there was no difference (p = 0.05) between high traffic/medium population and medium traffic/high population density areas. The regression analysis indicated a correlation between SO2 and the hourly traffic volume in almost all the sites.

Assessment of Kitchen Air Pollution: Health Implications for the Residents of Ilorin South, Nigeria

“…The GilAir 3 was used to monitor NO 2 and SO 2 , while the MSA Altair 5x multigas sensor was used to monitor CO. The sampler was placed in the direction of the wind and at a height where the pollutants were easily trapped [ 40 ]. NO 2 and SO 2 were trapped by preprepared selective absorption solutions with GilAir 3.…”

Influence of Climate and Height on the Levels of Sulphur Dioxide (SO<SUB>2</SUB>) in Sokoto High Traffic Density and Near Atmosphere Region

“…Air passed through the funnel suspended on a wooden stand (2m, 4m, 6m, 8m, 10m, and 12m high). It then passed through the dreschel bottle containing 100 cm 3 of 10% hydrogen peroxide solution for 60 minutes at a flow rate of 7.5 L/min, where sulphur dioxide gas was trapped by reacting with the hydrogen peroxide to form sulphuric acid [9].…”

“…They concluded that their technique could be used to obtain useful information to support air quality management decisions, as well as in -depth understanding of source strengths and potential impacts [9]. In another analysis [10] worked on the atmospheric level of SO 2 in Sokoto metropolis.…”