Studies were carried out to investigate the outdoor air pollution levels in vehicular traffic junctions in the major cities of Nsukka, Enugu and semi-urban area of Awgu all in Enugu State, Nigeria using standard analy...Studies were carried out to investigate the outdoor air pollution levels in vehicular traffic junctions in the major cities of Nsukka, Enugu and semi-urban area of Awgu all in Enugu State, Nigeria using standard analytical procedures. PM</span><sub><span style="font-family:Verdana;">2.5</span></sub><span style="font-family:Verdana;"> was collected using Envirotech air sampler, APM 550 and analyzed gravimetrically. Other determined air pollutant gases such as SO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">, NO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">, O</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> and CO were analyzed using colorimetric techniques. The mean hourly traffic density in the vehicular traffic junctions in Nsukka metropolis, Enugu metropolis and Awgu w</span></span><span style="font-family:Verdana;">ere</span><span style="font-family:""><span style="font-family:Verdana;"> 2015, 2873 and 587 respectively. The mean range of values of PM</span><sub><span style="font-family:Verdana;">2.5</span></sub><span style="font-family:Verdana;">, NO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">, SO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">, O</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> and CO in vehicular traffic junctions within the investigated environments w</span></span><span style="font-family:Verdana;">ere</span><span style="font-family:""><span style="font-family:Verdana;"> 1.67 - 12.16 μg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">, 3.72 - 23.83 μg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">, 2.96 - 30.09 μg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">, 5.45 - 66.54 μg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;"> and 1.18 - 15.17 ppm respectively. The mean levels of the determined air pollutants in the air around vehicular traffic junctions in Nsukka metropolis, Enugu metropolis and Awgu semi-urban area differed significantly. The mean levels of PM</span><sub><span style="font-family:Verdana;">2.5</span></sub><span style="font-family:Verdana;">, and CO in the air around vehicular traffic junctions in Enugu metropolis and CO in the air around traffic junctions in Nsukka metropolis were above the recommended permissible limits. Traffic density was therefore seen as the single most important factor contributing to the varying air pollution levels observed in the investigated environments.展开更多
文摘Studies were carried out to investigate the outdoor air pollution levels in vehicular traffic junctions in the major cities of Nsukka, Enugu and semi-urban area of Awgu all in Enugu State, Nigeria using standard analytical procedures. PM</span><sub><span style="font-family:Verdana;">2.5</span></sub><span style="font-family:Verdana;"> was collected using Envirotech air sampler, APM 550 and analyzed gravimetrically. Other determined air pollutant gases such as SO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">, NO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">, O</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> and CO were analyzed using colorimetric techniques. The mean hourly traffic density in the vehicular traffic junctions in Nsukka metropolis, Enugu metropolis and Awgu w</span></span><span style="font-family:Verdana;">ere</span><span style="font-family:""><span style="font-family:Verdana;"> 2015, 2873 and 587 respectively. The mean range of values of PM</span><sub><span style="font-family:Verdana;">2.5</span></sub><span style="font-family:Verdana;">, NO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">, SO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">, O</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> and CO in vehicular traffic junctions within the investigated environments w</span></span><span style="font-family:Verdana;">ere</span><span style="font-family:""><span style="font-family:Verdana;"> 1.67 - 12.16 μg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">, 3.72 - 23.83 μg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">, 2.96 - 30.09 μg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">, 5.45 - 66.54 μg/m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;"> and 1.18 - 15.17 ppm respectively. The mean levels of the determined air pollutants in the air around vehicular traffic junctions in Nsukka metropolis, Enugu metropolis and Awgu semi-urban area differed significantly. The mean levels of PM</span><sub><span style="font-family:Verdana;">2.5</span></sub><span style="font-family:Verdana;">, and CO in the air around vehicular traffic junctions in Enugu metropolis and CO in the air around traffic junctions in Nsukka metropolis were above the recommended permissible limits. Traffic density was therefore seen as the single most important factor contributing to the varying air pollution levels observed in the investigated environments.
