Based on the online monitoring data of atmospheric O3 at University Town that located in the western Shenzhen in the past 5years, combined with the comprehensive observation of atmospheric pollutants, the evolution trend of atmospheric O3 was obtained. In addition, the variations of meteorological conditions and the precursor's composition of O3 during the exceeding standard periods were deeply explored in order to grasp the causes. The resultsshow that the increase rate of the maximum 8-hour average mixing ratio of atmospheric O3 was 1.1×10-9/a, and the exceed-standard rate was over 6%. High temperature and low humidity meteorological conditions were more likely to promote atmospheric O3 formation. The increase of VOCs in the O3 exceeding standard periods (70%~95%) was significantly higher than that of NOx (28%), and the O3 high concentration was distributed in the high VOCs and low NOx region, indicating that the O3 formation was mainly controlled by VOCs in University Town of Shenzhen. The toluene to benzene ratio (T/B) over 10at night during the O3 exceeding standard periods suggesting that there may be a large amount of industrial emissions, while the consumption of OVOCs doubled at noon, indicating that OVOCs emitted by industrial activities may contribute significantly to daytime O3 production.
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WANG Chuan, XIA Shi-yong, CAO Li-ming, YU Guang-he, HUANG Xiao-feng. Study on the characteristics and the cause of atmospheric O3 pollution in western urban of Shenzhen. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1414-1420.
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