{"title":"Underestimated benefits of NOx control in reducing SNA and O3 based on missing heterogeneous HONO sources","authors":"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","doi":"10.1007/s11783-024-1790-y","DOIUrl":null,"url":null,"abstract":"<p>Substantial NO<sub><i>x</i></sub> emission mitigation is crucial for the synergistic reduction of particulate matter and ozone (O<sub>3</sub>) pollution in China. The traditional air quality model does not consider heterogeneous HONO chemistry, leading to uncertainties in estimating the benefits of NO<sub><i>x</i></sub> 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<sub>3</sub>, thus adding the heterogeneous reactions of HONO into air quality models inevitably leads to changes in the estimated benefits of NO<sub><i>x</i></sub> abatement. Here we investigated the changes in SNA and O<sub>3</sub> concentrations from NO<sub><i>x</i></sub> 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<sub><i>x</i></sub> reduction in terms of SNA control in winter. With 80% NO<sub><i>x</i></sub> 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<sub>3</sub> in summer caused by NO<sub><i>x</i></sub> 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<sub><i>x</i></sub> controls for the reduction of SNA and O<sub>3</sub> after considering heterogeneous HONO formation in a complex chemical ambient, demonstrating the importance of NO<sub><i>x</i></sub> controls in reducing PM<sub>2.5</sub> and O<sub>3</sub> pollution in China.\n</p>","PeriodicalId":12720,"journal":{"name":"Frontiers of Environmental Science & Engineering","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Frontiers of Environmental Science & Engineering","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s11783-024-1790-y","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
Substantial NOx emission mitigation is crucial for the synergistic reduction of particulate matter and ozone (O3) pollution in China. The traditional air quality model does not consider heterogeneous HONO chemistry, leading to uncertainties in estimating the benefits of NOx 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 O3, thus adding the heterogeneous reactions of HONO into air quality models inevitably leads to changes in the estimated benefits of NOx abatement. Here we investigated the changes in SNA and O3 concentrations from NOx 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 NOx reduction in terms of SNA control in winter. With 80% NOx 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) O3 in summer caused by NOx reduction increased slightly from 4.7% to 5.2% after adding heterogeneous HONO reactions. The results in this study highlight the enhanced effectiveness of NOx controls for the reduction of SNA and O3 after considering heterogeneous HONO formation in a complex chemical ambient, demonstrating the importance of NOx controls in reducing PM2.5 and O3 pollution in China.
期刊介绍:
Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines.
FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.