沈阳市大气中苯并[a]芘的环境特征

Environmental Characteristics of Benzo〔a〕pyrene in Atmosphere in Shenyang City

通过1996—2000年对沈阳市大气中苯并[a]芘的连续监测,结果表明:沈阳市大气中苯并[a]芘的污染程度不容乐观。大气中苯并[a]芘有明显的季节变化,夏季<秋(春季)<冬季;采暖期>非采暖期。大气中BaP在工业区的含量最高,其次是居民区,商业区、文化区和清洁区。生活燃煤污染、工业污染和扬尘污染是沈阳市大气中BaP的主要来源,同时受到交通废气排放的影响较大,区域环境背景中BaP对大气中BaP的作用也十分明显。

Based on the continuous monitoring of Benzo〔a〕pyrene (BaP)between 1996 and 2000 in Shenyang, the results show that pollution of BaP is serious.The yearly-average and the max daily-average content of BaP are decreasing with seasonsl variation. The sequence of the seasonal variation of the average content of BaP is : summer<autumn(spring)<winter. BaP in the heating period is larger than that in the non-heating period. BaP in the industrial estate is the largest in Shenyang. The variation of NOX takes first effect on BaP, the following SO2 and TSP and the last CO and Pb. The domestic coal burning for heating, industrial pollution and the raising dust are the main sources of BaP in Shenyang, and BaP is influenced by the traffic exhaust emission and the content of BaP in the background. 