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City-level air quality improvement in the Beijing-Tianjin-Hebei region from 2016/17 to 2017/18 heating seasons: Attributions and process analysis

Zhang, Yibo and Chen, Xue and Yu, Shaocai and Wang, Liqiang and Li, Zhen and Li, Mengying and Liu, Weiping and Li, Pengfei and Rosenfeld, Daniel and Seinfeld, John H. (2021) City-level air quality improvement in the Beijing-Tianjin-Hebei region from 2016/17 to 2017/18 heating seasons: Attributions and process analysis. Environmental Pollution, 274 . Art. No. 116523. ISSN 0269-7491. https://resolver.caltech.edu/CaltechAUTHORS:20210119-143307488

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Abstract

With the implementation of clean air strategies, PM_(2.5) pollution abatement has been observed in the “2 + 26” cities in the Beijing-Tianjin-Hebei (BTH) region (referred to as the BTH2+26) and their surrounding areas. To identify the drivers for PM_(2.5) concentration decreases in the BTH2+26 cites from the 2016/17 heating season (HS1617) to the 2017/18 heating season (HS1718), we investigated the contributions of meteorological conditions and emission-reduction measures by Community Multi-Scale Air Quality (CMAQ) model simulations. The source apportionments of five sector sources (i.e., agriculture, industry, power plants, traffic and residential), and regional sources (i.e., local, within-BTH: other cities within the BTH2+26 cities, outside-BTH, and boundary conditions (BCON)) to the PM_(2.5) decreases in the BTH2+26 cities were estimated with the Integrated Source Apportionment Method (ISAM). Mean PM_(2.5) concentrations in the BTH2+26 cities substantially decreased from 77.4 to 152.5 μg m⁻³ in HS1617 to 52.9–101.9 μg m⁻³ in HS1718, with the numbers of heavy haze (daily PM_(2.5) ≥150 μg m⁻³) days decreasing from 17-77 to 5–30 days. The model simulation results indicated that the PM_(2.5) concentration decreases in most of the BTH2+26 cities were attributed to emission reductions (0.4–55.0 μg m⁻³, 2.3–81.6% of total), but the favorable meteorological conditions also played important roles (1.9–25.4 μg m⁻³, 18.4–97.7%). Residential sources dominated the PM_(2.5) reductions, leading to decreases in average PM_(2.5) concentrations by more than 30 μg m⁻³ in severely polluted cities (i.e., Shijiazhuang, Baoding, Xingtai, and Beijing). Regional source analyses showed that both local and within-BTH sources were significant contributors to PM_(2.5) concentrations for most cities. Emission controls in local and within-BTH sources in HS1718 decreased the average PM_(2.5) concentrations by 0.1–47.2 μg m⁻³ and 0.3–22.1 μg m⁻³, respectively, relative to those in HS1617. Here we demonstrate that a combination of favorable meteorological conditions and anthropogenic emission reductions contributed to the improvement of air quality from HS1617 to HS1718 in the BTH2+26 cities.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.envpol.2021.116523DOIArticle
ORCID:
AuthorORCID
Yu, Shaocai0000-0001-9718-8246
Liu, Weiping0000-0002-1173-892X
Rosenfeld, Daniel0000-0002-0784-7656
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2021 Published by Elsevier. Received 25 July 2020, Revised 27 December 2020, Accepted 14 January 2021, Available online 18 January 2021. This work was partially supported by the Department of Science and Technology of China (No. 2016YFC0202702, 2018YFC0213506, and 2018YFC0213503), National Research Program for Key Issues in Air Pollution Control in China (No. DQGG0107), and National Natural Science Foundation of China (No. 21577126 and 41561144004). Part of this work was also supported by the “Zhejiang 1000 Talent Plan” and Research Center for Air Pollution and Health in Zhejiang University. Pengfei Li is supported by Initiation Fund for Introducing Talents of Hebei Agricultural University (412201904). We would like to thank Yujie Wu for his helps in the model simulations. Authorship contribution statement: S.Y., and Y.Z. conceived and designed the research. Y.Z and S.Y. performed model simulations and the data analyses. X.C., M.L., L.W., P. L. Z.L., W. L., and D.R. contributed to the scientific discussions. S.Y., Y.Z. and J.H.S wrote the paper. Declaration of competing interest: Authors declare no conflict of interests.
Funders:
Funding AgencyGrant Number
Department of Science and Technology (China)2016YFC0202702
Department of Science and Technology (China)2018YFC0213506
Department of Science and Technology (China)2018YFC0213503
National Research Program for Key Issues in Air Pollution Control in ChinaDQGG0107
National Natural Science Foundation of China21577126
National Natural Science Foundation of China41561144004
Zhejiang 1000 Talent PlanUNSPECIFIED
Zhejiang UniversityUNSPECIFIED
Hebei Agricultural University412201904
Subject Keywords:BTH2+26 cities; air quality improvement; source apportionment; emission reduction; meteorological contribution
Record Number:CaltechAUTHORS:20210119-143307488
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210119-143307488
Official Citation:Yibo Zhang, Xue Chen, Shaocai Yu, Liqiang Wang, Zhen Li, Mengying Li, Weiping Liu, Pengfei Li, Daniel Rosenfeld, John H. Seinfeld, City-level air quality improvement in the Beijing-Tianjin-Hebei region from 2016/17 to 2017/18 heating seasons: Attributions and process analysis, Environmental Pollution, Volume 274, 2021, 116523, ISSN 0269-7491, https://doi.org/10.1016/j.envpol.2021.116523. (http://www.sciencedirect.com/science/article/pii/S0269749121001019)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107558
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:19 Jan 2021 23:41
Last Modified:29 Jan 2021 18:47

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