Articles | Volume 19, issue 16
https://doi.org/10.5194/acp-19-10801-2019
https://doi.org/10.5194/acp-19-10801-2019
Research article
 | 
27 Aug 2019
Research article |  | 27 Aug 2019

Severe winter haze days in the Beijing–Tianjin–Hebei region from 1985 to 2017 and the roles of anthropogenic emissions and meteorology

Ruijun Dang and Hong Liao

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Short summary
We used a global chemical transport model to examine the historical changes in severe winter haze days (SWHDs) in Beijing–Tianjin–Hebei (BTH) in China. Simulated frequency of SWHDs in BTH showed an increasing trend over 1985–2017 with obvious fluctuations. We found that meteorology has dominated the frequency decrease in 1992–2001, and both anthropogenic emissions and meteorology contributed to the increase in 2003–2012. These results have important implications for the control of SWHDs in BTH.
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