Ambient Ozone Control in a Photochemically Active Region: Short-Term Despiking or Long-Term Attainment?

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• 作者：Jiamin Ou ; Zibing Yuan ; Junyu Zheng ; Zhijiong Huang ; Min Shao ; Zekun Li ; Xiaobo Huang ; Hai Guo ; Peter K. K. Louie
• 刊名：Environmental Science & Technology
• 出版年：2016
• 出版时间：June 7, 2016
• 年：2016
• 卷：50
• 期：11
• 页码：5720-5728
• 全文大小：584K
• 年卷期：0
• ISSN：1520-5851

文摘

China has made significant progress decreasing the ambient concentrations of most air pollutants, but ozone (O₃) is an exception. O₃ mixing ratios during pollution episodes are far higher than the national standard in the Pearl River Delta (PRD), thus greater evidence-based control efforts are needed for O₃ attainment. By using a validated O₃ modeling system and the latest regional emission inventory, this study illustrates that control strategies for short-term O₃ despiking and long-term attainment in the PRD may be contradictory. VOC-focused controls are more efficient for O₃ despiking in urban and industrial areas, but significant NO_x emission reductions and a subsequent transition to a NO_x-limited regime are required for O₃ attainment. By tracking O₃ changes along the entire path toward long-term attainment, this study recommends to put a greater focus on NO_x emission controls region-wide. Parallel VOC reductions around the Nansha port are necessary in summertime and should be extended to the urban and industrial areas in fall with a flexibility to be strengthened on days forecasted to have elevated O₃. Contingent VOC-focused controls on top of regular NO_x-focused controls would lay the groundwork for striking a balance between short-term despiking and long-term attainment of O₃ concentrations in the PRD.