Yi-Cheng Lin1, Fang-Yi Cheng This email address is being protected from spambots. You need JavaScript enabled to view it.1, Yi-Ju Lee1, Thi-Thuy-Nghiem Nguyen2, Chuen-Jinn Tsai2, Huan-Cheng Wen3, Cheng-Hung Wu3, Wei-Chieh Chang3, Chung-Chi Huang3 

1 Department of Atmospheric Sciences, National Central University, Taoyuan, Taiwan
2 Institute of Environmental Engineering, National Yang-Ming Chiao Tung University, Hsinchu, Taiwan
3 Department of Environmental Protection, Taiwan Power Company, Taipei, Taiwan

Received: March 17, 2023
Revised: September 7, 2023
Accepted: September 18, 2023

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.230059  

Cite this article:

Lin, Y.C., Cheng, F.Y., Lee, Y.J., Nguyen, T.T.N., Tsai, C.J., Wen, H.C., Wu, C.H., Chang, W.C., Huang, C.C. (2023). Assessments of the Emission Contributions from an Ultra-Supercritical Coal-Fired Power Plant to Ambient PM2.5 in Taiwan. Aerosol Air Qual. Res. 23, 230059. https://doi.org/10.4209/aaqr.230059


  • A SC coal-fired power plant was upgraded with an USC power generator.
  • Quantify emissions contributions from the coal-fired power plant to PM2.5 concentrations.
  • Upgrading the power generators from SC to USC reduces PM2.5 concentrations.
  • The USC coal-fired power plants contribute substantially to PM2.5 with weak wind flow.


An ultra-supercritical (USC) coal-fired power plant was built to replace the old subcritical (SC) unit in the Linkou power plant (LPP) in northern Taiwan and has been in operation since 2016. Compared to the old SC power generator, the renovated unit (USC + emission control) can reduce SOx, NOx, and TSP emissions by 65%, 87% and 77%, respectively. Enhancing thermal efficiency can significantly reduce air pollutant emissions; however, its impact on ambient air pollutant concentrations under various meteorological conditions is rarely studied. To clarify the issue, we utilized the Community Multiscale Air Quality (CMAQ) model to estimate the contributions of the emissions from old and renovated LPP on the ambient PM2.5 concentrations in Taiwan. During the one-month study period, the LPP upgrade can reduce the PM2.5 concentrations to more than 10 µg m–3 for a severe PM2.5 episode when the weak wind persisted for several days. The reductions were most significant in northern Taiwan. Even with the substantial emission reductions through the advanced USC units, the LPP emissions contribute considerably to the PM2.5 concentrations, with a maximum reaching 5.1 µg m–3 (10.3%). This study quantitatively assesses the environmental burden that a USC coal-fired power plant places on the ambient PM2.5 concentrations.

Keywords: Ultra-supercritical coal-fired power plant, PM2.5, Emission contribution, Community Multiscale Air Quality Model (CMAQ), Weather condition

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