Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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
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 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 1 h ozone (O3 1 h) was all increasing at urban sites (1.79 ppbv yr−1) and DL background station (2.05 ppbv yr−1) while daily maximum 8 h average ozone concentration (O3 8 h) was increasing in urban area (1.14 ppbv yr−1) and slightly decreasing at DL background station (−0.47 ppbv yr−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 1 h 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 2~3 h 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.

Citation: Cheng, N., Li, Y., Zhang, D., Chen, T., Sun, F., Chen, C., and Meng, F.: Characteristics of Ground Ozone Concentration over Beijing from 2004 to 2015: Trends, Transport, and Effects of Reductions, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-508, 2016.
Nianliang Cheng et al.
Nianliang Cheng et al.

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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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