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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-173
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
28 Mar 2017
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Differentiating local and regional sources of Chinese urban air pollution based on effect of Spring Festival
Chuan Wang, Xiao-Feng Huang, Qiao Zhu, Li-Ming Cao, Bin Zhang, and Ling-Yan He Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
Abstract. The emission of pollutants is extremely reduced during the annual Chinese Spring Festival (SF) in Shenzhen, China. During the SF, traffic flow drops by ~ 50 % and the industrial plants are almost entirely shut down in Shenzhen. To characterize the variation in ambient air pollutants due to the Spring Festival effect, various gaseous and particulate pollutants were measured in real time in urban Shenzhen over three consecutive winters (2014–2016). The results indicate that the concentrations of NOx, volatile organic compounds (VOCs), black carbon (BC), primary organic aerosols, chloride, and nitrate in submicron aerosols decrease by 50 %–80 % during the SF period relative to the non-Spring Festival periods, regardless of meteorological conditions, which suggests that these pollutants are mostly emitted or secondarily formed from urban local emissions. The concentration decreasing of regional pollutants or species emitted from natural sources, however, is found to be much less, especially for bulk PM2.5 (−24 %) and O3 (6 %). More detailed analysis of the Spring Festival effect reveals an urgent need to reduce emissions of SO2 and VOCs on a regional scale rather than on an urban scale to reduce urban PM2.5 in Shenzhen, which can also produce some use for reference for other megacities in China.

Citation: Wang, C., Huang, X.-F., Zhu, Q., Cao, L.-M., Zhang, B., and He, L.-Y.: Differentiating local and regional sources of Chinese urban air pollution based on effect of Spring Festival, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-173, in review, 2017.
Chuan Wang et al.

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Short summary
The emission of pollutants is extremely reduced during the annual Chinese Spring Festival (SF) in Shenzhen, China. To characterize the variation in ambient air pollutants due to the SF, various pollutants were measured in real time in urban Shenzhen over three consecutive winters (2014–2016). The results indicate that reducing emissions of SO2 and VOCs on a regional scale rather than on an urban scale was found to be necessary to reduce urban PM2.5 in Shenzhen.
The emission of pollutants is extremely reduced during the annual Chinese Spring Festival (SF)...
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