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Mitigating NO_x emissions does not help alleviate wintertime particulate pollution in Beijing-Tianjin-Hebei (BTH), China

Li, Xia and Bei, Naifang and Hu, Bo and Wang, Yuan and Liu, Suixin and Wu, Jiarui and Pan, Yuepeng and Wen, Tianxue and Liu, Zirui and Liu, Lang and Wang, Ruonan and Zuo, Min and Shen, Zhenxing and Cao, Junji and Tie, Xuexi and Molina, Luisa T. and Li, Guohui (2020) Mitigating NO_x emissions does not help alleviate wintertime particulate pollution in Beijing-Tianjin-Hebei (BTH), China. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20201026-104108282

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Abstract

Stringent mitigation measures have reduced wintertime PM_(2.5) concentrations by 42.2% from 2013 to 2018 in the BTH. The observed nitrate aerosols have not exhibited a significant decreasing trend and constituted a major fraction (about 20%) of the total PM_(2.5), although the surface-measured NO₂ level has decreased by over 20%. It still remains elusive about contributions of nitrogen oxides (NO_x) emissions mitigation to the nitrate and PM_(2.5) level. The WRF-Chem model simulations of a persistent haze episode in January 2019 in the BTH reveal that NO_x emissions mitigation does not help lower wintertime nitrate and PM_(2.5) concentrations under current conditions in the BTH, because the substantial O₃ increase induced by NO_x mitigation offsets the HNO₃ loss and enhances sulfate and secondary organic aerosols formation. Our results are further consolidated by occurrence of the severe PM pollution in the BTH during the COVID-19 outbreak with a significant reduction of NO₂.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/essoar.10504089.1DOIDiscussion Paper
ORCID:
AuthorORCID
Hu, Bo0000-0002-3006-8810
Wang, Yuan0000-0001-6657-8401
Pan, Yuepeng0000-0002-5547-0849
Liu, Zirui0000-0002-1939-9715
Shen, Zhenxing0000-0002-1294-1751
Cao, Junji0000-0003-1000-7241
Tie, Xuexi0000-0002-2426-1577
Molina, Luisa T.0000-0002-3596-5334
Li, Guohui0000-0001-8868-7123
Additional Information:Published Online: Wed, 2 Sep 2020. This work is financially supported by the Strategic Priority Research Program of Chinese Academy of Sciences (XDB40030203), the National Key R&D Plan (2017YFC0210000), and National Research Program for Key Issues in Air Pollution Control (DQGG0105).
Funders:
Funding AgencyGrant Number
Chinese Academy of SciencesXDB40030203
National Key Research and Development Program of China2017YFC0210000
National Research Program for Key Issues in Air Pollution ControlDQGG0105
Record Number:CaltechAUTHORS:20201026-104108282
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201026-104108282
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106278
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Oct 2020 17:59
Last Modified:26 Oct 2020 17:59

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