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Gaseous Pollutants Levels and Sources of NO_x, SO_2 in Heating Period of Spring and Non-Heating Period of Summer in Siping City

SUN Yu-wei;WANG Lu-yao;College of Environmental Science and Engineering,Jilin Normal University;  
A comprehensive measurement program was undertaken in spring and summer in an urban city(Siping) in the Northeast Plain. The average concentrations of SO2,NOX during the heating period of spring and non-heating period of summer were 106.42 μg/m3,151.73 μg/m3and 66.07 μg/m3,65.03 μg/m3,respectively. The concentrations of SO2,NOx in this measurement program were lower than National Ambient Air Quality Standards(daily Grade-Ⅱ standards,GB3095-1996). In the heating period of spring,emissions from coal combustion were the main source. Pollutions in sampling site were influenced by local transmission from industrial park of Liaoning northern. Furthermore,cleanup effect of snowfall was a favorable factor for air quality. The diurnal variations of SO2 and NOX concentrations in the heating period of spring and non- heating period of summer were both suggested that the influence of vehicular exhaust emissions in the morning and afternoon was another source in Siping.
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