Study on the Pollution Characteristics and Sources of Ozone in Typical Loess Plateau City

被引:4
|
作者
Li, Bin [1 ]
Zhou, Zhuangzhi [1 ]
Xue, Zhigang [2 ]
Wei, Peng [2 ]
Ren, Yanjun [2 ]
Cao, Liyuan [3 ]
Feng, Xinyu [3 ]
Yao, Qingchen [3 ]
Ma, Jinghua [2 ]
Xu, Peng [2 ]
Chen, Xuan [2 ]
机构
[1] North Univ China, Sch Environm & Safety Engn, Taiyuan 030051, Peoples R China
[2] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China
[3] Taiyuan Ecoenvironm Monitoring Ctr Shanxi Prov, Taiyuan 030051, Peoples R China
关键词
ozone concentration; temporal and spatial variation; pollution cause; mountain wind; cluster analysis of backward trajectories; local generation; regional transport; SURFACE OZONE; AIR-POLLUTION; METEOROLOGY; VALLEY; AREA;
D O I
10.3390/atmos11060555
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Ground-level ozone is a secondary pollutant produced by photochemical reactions and it adversely affects plant and human health. Taiyuan City, a typical city on the loess plateau, is suffering from severe ozone pollution. We utilized the data from eight national environmental monitoring sites of Taiyuan, including concentrations of O(3)and nitric oxide, and meteorological factors, such as air temperature and wind, to study the pollution characteristics and sources of ozone (O-3) in Taiyuan in 2018. Results show that during 2018, the maximum value and 90th percentile of the maximum 8-h running average of O(3)concentration were 257 mu g/m(3)and 192 mu g/m(3), respectively. There were 72 days where the O(3)concentration exceeded the standard in 2018, which were mainly during April to August. The O(3)concentration increased from March, reached a high level in April through August, and decreased significantly from September. The O(3)concentrations displayed a typical "single peak" diurnal variation, which was high during the day with peak at around 13:00-15:00 and low at night. From April to August, the O(3)concentrations at Jinyuan was the highest, followed by Xiaodian and Taoyuan, and the O(3)concentrations at Shanglan and Nanzhai were the lowest. When the O(3)concentration exceeded the standard value, Jinyuan contributed the most to the O(3)pollution of Taiyuan, followed by Taoyuan and Xiaodian. High temperature and pressure, south and southwest winds can lead to an increase in O(3)concentration. The O(3)pollution in the Taiyuan urban area is caused by local generation, and the transportation of polluted air masses containing oxides of nitrogen (NOx) and volatile organic compounds (VOCs) emitted by industries, such as the coking and steel plants in counties of Jinzhong City in southern Taiyuan, and Qingxu County, and some counties in Lyuliang City to the southwest. In addition, the mountain winds and low nitric oxide concentration are the main reasons for the increase of O(3)concentration, often observed in Shanglan at night.
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页数:14
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