Underestimated benefits of NO_(x) control in reducing SNA and O_(3) based on missing heterogeneous HONO sources  

作　　者：Shuping Zhang Haotian Zheng Jun Liu Yao Shi Tianzeng Chen Chaoyang Xue Fenfen Zhang Yueqi Jiang Xiangping Zhang Shovan Kumar Sahu Biwu Chu Jia Xing 

机构地区：[1]State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China [2]China Academy of Civil Aviation Science and Technology,Beijing 100028,China [3]State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [4]Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China [5]Centre for Climate Research Singapore,Meteorological Service Singapore,Singapore 537054,Singapore

出　　处：《Frontiers of Environmental Science & Engineering》2024年第3期57-67,共11页环境科学与工程前沿（英文）

基　　金：supported by the Innovation Platform for Academicians of Hainan Province(No.YSPTZX202205);the National Key Research and Development Program of China(No.2022YFC3703404);the National Natural Science Foundation of China(No.22276205);the Excellent Young Talents Project of Yellow River Conservancy Commission(No.HQK-202313);the Research and Development Project of Yellow River Institute of Hydraulic Research(No.HKY-YF-2022-02)。

摘　　要：Substantial NO_(x) emission mitigation is crucial for the synergistic reduction of particulate matter and ozone(O_(3))pollution in China.The traditional air quality model does not consider heterogeneous HONO chemistry,leading to uncertainties in estimating the benefits of NO_(x) control.Previous studies have shown that the parameterization of heterogeneous HONO formation increases both the simulated value of sulfate–nitrate–ammonium(SNA)and that of O_(3),thus adding the heterogeneous reactions of HONO into air quality models inevitably leads to changes in the estimated benefits of NO_(x) abatement.Here we investigated the changes in SNA and O_(3)concentrations from NO_(x) emission reduction before and after adding heterogeneous HONO reactions in the Community Multi-Scale Air Quality(CMAQ)model.Including heterogeneous HONO reactions in the simulation improved the benefits of NO_(x) reduction in terms of SNA control in winter.With 80%NO_(x) reduction,the reduction in SNA increased from 36.9%without considering heterogeneous HONO reactions to 42.8%with heterogeneous HONO chemistry.The reduction in the maximum daily 8h average(MDA8)O_(3)in summer caused by NO_(x) reduction increased slightly from 4.7%to 5.2%after adding heterogeneous HONO reactions.The results in this study highlight the enhanced effectiveness of NO_(x) controls for the reduction of SNA and O_(3)after considering heterogeneous HONO formation in a complex chemical ambient,demonstrating the importance of NO_(x) controls in reducing PM2.5 and O_(3)pollution in China.

关 键 词：Heterogeneous HONO NO_(x) reduction PM_(2.5) O_(3) 

分 类 号：X51[环境科学与工程—环境工程]