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Eighteen air samples were collected from six locations in Effurun (Effurun Roundabout, Warri Refinery, Effurun Market) and in Warri (Enerhen Junction, NPA and Ogunu) environs and were analysed for Sulphur Dioxide (SO 2 ), Nitrogen Dioxide (NO 2 ) and Ozone (O 3 ). After various treatment of samples, SO 2, NO 2, O 3 where determined with Spectrophotometer (Perkin Elmer Lambada E = 301). Mean concentrations of SO2; 161±0.00ug/m 3 , 67±0.00ug/m 3 , 158±0.00ug/m 3 , 207±1.58ug/m 3 , 74±0.00 ug/m 3 and 39±0.00ug/m 3 were obtained for the six sampling locations respectively; NO 2 ; 138±1.58ug/m 3 , 123±0.00ug/m 3 , 141±0.00ug/m 3 , 241±1.58ug/m 3 , 52±1.58ug/m 3 and41±1.58ug/m 3 respectively for the six locations, and O 3 ; 8.34±0.0158ug/m 3 , 8.06±0.0158ug/m 3 , 8.33±0.00ug/m 3 , 8.21±0.071ug/m 3 , 8.13±0.00ug/m 3 and 8.03±0.07ug/m 3 respectively for the six locations. All the studied locations were found to be contaminated/slightly polluted by these gaseous components. This calls for measures to mitigate these due to the possible health implications of the pollutants. Key Words: Warri, Effurun, Passive method, Gaseous pollution

Determination of levels of some inorganic gaseous contaminants in Warri and effurun in Delta State, Nigeria