Daytime atmospheric sulphur dioxide concentrations in Ibadan city, Nigeria

  • P.C. Onianwa
  • S.O. Fakayode
  • B.O. Agboola


Atmospheric sulphur dioxide concentrations were determined at 27 locations in the city of Ibadan, Nigeria, during May-June 1997. The locations were chosen from zones of high and low traffic densities, residential areas, industrial areas, and remote (control) areas. Sulphur dioxide levels did not significantly vary with the time of day of sampling, which was between 9 a.m. and 5 p.m. Average levels were: high and medium traffic density zones, 34.8 mg/m3; low traffic density and residential zones, 20.0 mg/m3; industrial zones, 68.9 mg/m3; and control zones, 14.5 mg/m3. The average level for all the zones, 34.1 mg/m3, is within the limits of worldwide guidelines for air quality, but slightly higher than prevailing levels in some cities of the developed countries.

(Received January 5, 2001; revised July 10, 2001)

(Bulletin of The Chemical Society of Ethiopia: 2003 15 (1): 71-78)


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eISSN: 1726-801X
print ISSN: 1011-3924