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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (3): 36-46.DOI: 10.7522/j.issn.1000-694X.2022.00128

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The temporal and spatial characteristics of ambient air quality in Shaanxi

Jiayin Zhang1(), Yunfei Guo3, Shun Xiao2(), Tao Du1, Hao Zheng1, Huanwu Liu4, Lei Wang1, Yanxin He4   

  1. 1.Shaanxi Key Lab for Environmental Monitoring and Forewarning of Trace Pollutants,Shaanxi Environmental Monitoring Center,Xi'an 710054,China
    2.School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China
    3.Xi'an Thermal Power Research Institute CO. ,LTD,Xi'an 710054,China
    4.Xi'an Environmental Monitoring Station,Xi'an 710018,China
  • Received:2022-08-28 Revised:2022-10-03 Online:2023-05-20 Published:2023-05-31
  • Contact: Shun Xiao

Abstract:

This paper analyzed the monitoring data of Shaanxi Province's automatic ambient air quality monitoring stations during 2017-2021, discussed the characteristics of month-to-month, seasonal and annual changes in air quality, and the spatial distribution of different pollutants in the Shaanxi Province. This paper also analyzed the characteristics and causes of ambient air quality pollution during periods of heavy pollution in different regions. The results show that: (1) Air quality in Shaanxi Province gradually improved during 2017-2021, with air quality improvement in Guanzhong > Southern Shaanxi > Northern Shaanxi, with an average annual decrease of 12.5% for SO2, 9.9% for CO, and 7.2% for PM2.5. (2) Air quality in Shaanxi Province is characterized by heavier pollution in Guanzhong and north of northern Shaanxi, lighter pollution in southern Shaanxi and south of northern Shaanxi, and more pollution in cities than in suburban counties. (3) There are obvious seasonal change characteristics for air quality in Shaanxi Province, with heavy pollution weather mostly concentrated in the heating season and spring (January, February, March, November, December). There are obvious differences in the primary pollutants when heavy pollution occurs in different regions. The primary pollutants on heavily polluted days in northern Shaanxi is PM10 (100%), in Guanzhong is PM2.5 (82%), PM10 (17%) and O3 (1%), and in southern Shaanxi is PM2.5 (81%) and PM10 (19%). (4) The ozone (O3) pollution situation in Shaanxi Province in recent years is more serious, and countermeasures should be taken to effectively curb the rising trend of ozone concentration.

Key words: ambient air quality, ozone, particulate, Fenwei Plain

CLC Number: