22 May 2023
 | 22 May 2023
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Benefits of Net Zero policies for future ozone pollution in China

Zhenze Liu, Oliver Wild, Ruth M. Doherty, Fiona M. O’Connor, and Steven T. Turnock

Abstract. Net Zero emission policies principally target climate change, but may have a profound influence on surface ozone pollution. To investigate this, we use a chemistry-climate model to simulate surface ozone changes in China under a Net Zero pathway, and examine the different drivers that govern these changes. We find large monthly mean surface ozone decreases of up to 16 ppb in summer and small ozone decreases of 1 ppb in winter. Local emissions are shown to have the largest influence on future ozone changes, outweighing the effects of changes in emissions outside China, changes in global methane concentrations and a warmer climate. Impacts of local and external emissions show strong seasonality, with the largest contributions to surface ozone in summer, while changes in global methane concentrations have a more uniform effect throughout the year. We find that while a warmer climate has a minor impact on ozone change compared to the Net Zero scenario, it will alter the spatial patterns of ozone in China, leading to ozone increases in the south and ozone decreases in the north. We also apply a deep learning model to correct biases in our ozone simulations, and to provide a more robust assessment of ozone changes. We find that emission controls may lead to a surface ozone decrease of 5 ppb in summer. This is smaller than that simulated with the chemistry-climate model, reflecting overestimated ozone formation under present-day conditions. Nevertheless, this assessment clearly shows that the strict emission policies needed to reach Net Zero will have a major benefit in reducing surface ozone pollution and the occurrence of high ozone episodes, particularly in high-emission regions in China.

Zhenze Liu et al.

Status: open (until 03 Jul 2023)

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Zhenze Liu et al.


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Short summary
We investigate the impact of Net Zero policies on surface ozone pollution in China. A chemistry-climate model is used to simulate ozone changes driven by local and external emissions, methane concentrations and warmer climates. We apply a deep learning model to generate more robust ozone projection. While the benefits of Net Zero policies on ozone mitigation may be overestimated with the chemistry-climate model, it is clear that the policies can substantially reduce ozone pollution in future.