Abstract：
A big gap exists between current air quality in China and the World Health Organization (WHO) global air quality guidelines (AQG) released in 2021. Previous studies on air pollution control have focused on emission reduction demand in China but ignored the influence of transboundary pollution, which has been proven to have a significant impact on air quality in China. Here, we develop an emission-concentration response surface model coupled with transboundary pollution to quantify the emission reduction demand for China to achieve WHO AQG. China cannot achieve WHO AQG by its own emission reduction for high transboundary pollution of both PM2.5 and O3. Reducing transboundary pollution will loosen the reduction demand for NH3 and VOCs emissions in China. However, to meet 10 μg·m-3 for PM2.5 and 60 μg·m-3 for peak season O3, China still needs to reduce its emissions of SO2, NOx, NH3, VOCs, and primary PM2.5 by more than 95, 95, 76, 62, and 96% respectively, on the basis of 2015. We highlight that both extreme emission reduction in China and great efforts in addressing transboundary air pollution are crucial to reach WHO AQG.
摘要：
中国目前的空气质量与世界卫生组织（WHO）2021年发布的全球空气质量指南（AQG）之间存在很大差距。以往关于大气污染控制的研究主要集中在中国的减排需求上,却忽视了跨界污染的影响,这已被证明对中国的空气质量有重大影响。这里,我们建立了排放浓度响应面模型，并结合跨界污染来量化中国实现WHOAQG的减排需求。中国无法通过自身对PM2.5和O3的高度跨界污染的减排来实现WHOAQG。减少跨界污染将放松中国对NH3和VOCs排放的减排需求。然而,为了满足PM2.5的10μg·m-3和旺季O3的60μg·m-3，中国仍需要减少SO2，NOx的排放，NH3,VOCs,和初级PM2.5分别超过95%、95%、76%、62%和96%，在2015年的基础上。我们强调，中国的极端减排和应对跨界空气污染的巨大努力对于达到世卫组织AQG至关重要。
