上海市中心城区臭氧污染水平和变化状况

Spate of Odor Pollution and Its Change in the Center Urban Area of Shanghai

利用上海市虹口监测点2002年O3的连续自动监测数据,分析了该点代表的区域范围内O3的污染水平、变化情况,以及O3与NO、NOx和CO的关系。指出该点O3的污染水平是冬季最低,秋季最高,5月至10月的质量浓度明显高于11月至4月,低质量浓度时段在早晨,高质量浓度时段在中午至午后;O3质量浓度的变化范围和上升速率是5月至10月比11月至4月大;O3的产生主要取决于NOx中NO转换成NO2的程度,而CO也同NO一样,当O3质量浓度在中午至午后较高时,CO质量浓度也不高。

Automatic monitoring data of O3 in 2002 acquired from the monitoring site in Hongkou, Shanghai, were analyzed to obtain the result about the pollution state and change situation of O3 and the relationship among O3, NO, NOx and CO. Pollution state of O3 in this site was that, lowest in winter, highest in fall. The average mass concentration of O3 from May to October was obvious higher that from December to April. In morning the mass concentration was lower, and in noon and afternoon it was higher. The change arrange and raised rate of O3's mass concentration was greater between May and Octorber than between Decomber and April. The degree that NOx was changed to NO determined the amount of O3, and the state of CO was same as NO. When the mass concentration of O3 was higher in noon to afternoon the mass concentration of CO was not too high.