北京市国庆期间SO_2、CO、NO_x与O_3的监测与分析

于2001年国庆期间对北京市大气污染物SO2、CO、NOx与O3进行了连续监测,分析了各污染物浓度的变化特点及污染物之间的关系,评价了监测期间北京市的空气质量状况。结果表明:SO2、CO、NOx、O3体积分数均有明显的日变化特征。SO2体积分数日变化特征与冬季采暖期相比差异较大;NOx、CO体积分数的日变化趋势相近,低值区均出现在白天11:00～17:00;O3体积分数日变化特征显著,最大值出现在午后14:00左右,局地光化学反应生成是白天低层O3的主要来源。由相关性分析可知,O3与NOx呈负相关,相关系数为-0.53;CO与NOx呈正相关,相关系数为0.85。

Monitoring and Analysis of SO2,CO,NOx and O3 in Beijing During the National Holidays

The measurements of SO2、CO、NOx and O3 were carried out continuously during the National Holidays in 2001,the variation characteristics and the relativity of air pollutants were analyzed,and the air quality in Beijing during the National Holidays was assessed based on the measurements. The results indicated that the diurnal variations of SO2、CO、NOx and O3 concentration were remarkable. The diurnal variations of SO2 concentration were significantly different between non-heating period during the National Holidays and heating period in winter. Daily variations of concentrations of NOx and CO were similar, and very low concentration occurred during 11:00～17:00. The diurnal variation of O3 concentration was remarkably,the highest concentration of O3 occurred at 14:00 in the after-noon. And the photochemistry reaction was an important source in the low layer in daytime. In addition,the correlation analysis showed that NOx concentration has positive relativity with CO concentration (R=0.85)and negative relativity with O3 concentration (R=-0.53).