四平市春季供暖期与夏季非供暖期大气NO_x、SO_2污染特征和来源

2012年6月10日—16日,2013年3月18日—4月4日在四平市区对大气污染物NOX和SO2进行监测。采样期间春季供暖期SO2和NOX浓度平均值分别为106.42μg/m3和151.73μg/m3;夏季非供暖期SO2和NOX浓度平均值分别为66.07μg/m3和65.03μg/m3。春夏两季SO2和NOX的浓度均低于空气环境质量标准(GB3095—1996)。春季四平市大气质量受辽北地区工业排放源的区域传输影响较大,并且降雪对空气净化作用明显。夏季非供暖期空气中SO2和NOX浓度值明显降低,说明四平市春季SO2和NOX的主要来源为燃煤供暖排放。SO2和NOX浓度的总体日变化趋势与供暖期相似:早晚上、下班高峰期数值较高,汽车尾气的排放也对污染物的浓度有一定的影响。

Gaseous Pollutants Levels and Sources of NOx,SO2 in Heating Period of Spring and Non- Heating Period of Summer in Siping City

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/m3 and 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.