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Discussion papers | Copyright
https://doi.org/10.5194/acp-2016-508
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Aug 2016

Research article | 10 Aug 2016

Characteristics of Ground Ozone Concentration over Beijing from 2004 to 2015: Trends, Transport, and Effects of Reductions

Nianliang Cheng1,2,3, Yunting Li1, Dawei Zhang1,4, Tian Chen5, Feng Sun1,6, Chen Chen1,6, and Fan Meng2,3 Nianliang Cheng et al.
  • 1Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Environmental Monitoring Center, Beijing 100048, China
  • 2College of Water Sciences, Beijing Normal University, Beijing 100875, China
  • 3State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
  • 4Department of Environmental Science and Engineering,Tsinghua University, Beijing 100084, China
  • 5Beijing Municipal Environmental Protection Bureau, Beijing 100044, China
  • 6Department of Environmental Science, Peking University, Beijing 100871, China

Abstract. Based on the hourly ozone monitoring data during 2004–2015 in urban area and at DL background station in Beijing, a comprehensive discussion of the characteristics of ozone concentration was conducted. Annual concentration of daily maximum 1h ozone (O3 1h) was all increasing at urban sites (1.79ppbvyr−1) and DL background station (2.05ppbvyr−1) while daily maximum 8h average ozone concentration (O3 8h) was increasing in urban area (1.14ppbvyr−1) and slightly decreasing at DL background station (−0.47ppbvyr−1) from 2004 to 2015 due to different ozone sensitivity regimes and ratios of NO2/NO. Diurnal variation of ozone peaks obtained at downwind DL station were about 1h later than that in urban area from May to October in different years and concentration of ozone at a DL background station was much higher than that of urban sites. Moreover, the difference of ozone peaks between urban sites and DL background station was significantly becoming smaller in recent years, which may be related to the regional ozone transport and the expansion urbanization of Beijing. Based on the joint efforts of regional air pollution prevention and control,Beijing achieved Sep 3 military blue. Calculated average concentrations of CO, NO2, and O3 in S2 (Aug 20~31, 2015) and S3 (Sep 01~03, 2015) decreased by 31.48%, 43.97%, and 13.21% at urban sites, and by 20.93%, 57.10%, and 23.62% at DL station, respectively compared with those in S1 (Aug 01~19,2015) and S4 Sep 04~30, 2015). A reduction of local anthropogenic emissions such as VOCs and NOx could reduce ozone efficiently especially in downwind areas of Beijing and made the ozone peaks decrease significantly and appear 2~3h earlier compared to the scenarios of no emission reductions. Compared to the increasing ozone during Asia-Pacific Economic Cooperation (APEC)meeting period,to decrease the ozone concentration in Beijing, VOCs emissions should be reduced larger and be controlled stricter than that of NOx in Beijing and the policy of regional air pollution joint prevention and control should still be promoted unswervingly and jointly in the further.

The discussion paper was formally withdrawn.
Nianliang Cheng et al.
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Nianliang Cheng et al.
Nianliang Cheng et al.
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The requested manuscript was not accepted for publication in Atmospheric Chemistry and Physics and was retracted upon request of the authors.

Short summary
1. Trends of ground-level ozone in Beijing from 2004 to 2015 were first analyzed. 2. Difference between urban sites and background site of ozone in Beijing was becoming smaller. 3. Changes in ozone and its precursors in Beijing during the period of regional air quality assurance period were compared and analyzed. As regional-scale emission reduction measures were highly effective in improving air quality in Beijing, the future direction of air pollution control is regional control.
1. Trends of ground-level ozone in Beijing from 2004 to 2015 were first analyzed. 2. Difference...
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