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Peer-reviewedCC BYEnvironmental Science and Ecotechnology

Asymmetric intensification of heatwave-ozone compound extremes across China at 1 km resolution from 2000 to 2023

5 more authors
10 affiliations
  1. 1Department of Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
  2. 2Department of Non-Communicable Disease Prevention and Control, Shenzhen Longgang Center for Chronic Disease Control, Shenzhen, Guangdong, 518172, China
  3. 3MEEKL-AERM, College of Environmental Sciences and Engineering, Institute of Tibetan Plateau, and Center for Environment and Health, Peking University, Beijing, 100871, China
  4. 4NHC Key Laboratory of Male Reproduction and Genetics, Guangdong Provincial Reproductive Science Institute (Guangdong Provincial Fertility Hospital), Guangzhou, Guangdong, 510600, China
  5. 5Central Laboratory of Shenzhen Center for Disease Control and Prevention, Shenzhen, Guangdong, 518055, China
  6. 6School of Public Health, Shenzhen University Medical School, Shenzhen University, Shenzhen, Guangdong, 518055, China
  7. 7Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, Guangdong, 511430, China
  8. 8Department of Environment and Health, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, 210009, China
  9. 9Organ Transplantation Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China; Corresponding author. Organ Transplantation Center, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan Second Road, Guangzhou, Guangdong, 510080, China.
  10. 10Department of Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China; Corresponding author. Department of Epidemiology, School of Public Health, Sun Yat-sen University, 74 Zhongshan Second Road, Guangzhou, Guangdong, 510080, China.

Abstract

Compound heatwave and ozone pollution events threaten public health as warming and photochemistry intensify. Yet the internal architecture of these events—how heatwaves and ozone separately influence frequency versus intensity—remains poorly resolved at national scale. Here we show, using 1 km resolution grids across China from 2000 to 2023, that heatwaves dominate the frequency of compound extremes while ozone dominates their intensity, and that this asymmetry strengthened after 2016. Population exposure rose primarily because the events themselves intensified, rather than from population growth. City-level influencing factors proved highly heterogeneous, reflecting local combinations of meteorology, pollution and socioeconomic conditions. These findings uncover an asymmetric architecture of compound risk and identify distinct levers—heat versus ozone—for targeted mitigation under continued warming.

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BibTeX
@article{bi2026asymmetric,
  title = {{Asymmetric intensification of heatwave-ozone compound extremes across China at 1 km resolution from 2000 to 2023}},
  author = {Yuxin Bi and Ruijun Xu and Yi Zheng and Nongping Feng and Jing Wei and Sirong Wang and Lu Luo and Jinying Huang and Kaiwen Zuo and Qiling Wang and Xinzong Zhang and Ziquan Lv and Suli Huang and Xue-Yan Zheng and Hong Sun and Ronghai Deng and Yuewei Liu},
  journal = {Environmental Science and Ecotechnology},
  year = {2026},
  month = sep,
  doi = {10.1016/j.ese.2026.100761},
  url = {https://doi.org/10.1016/j.ese.2026.100761},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Asymmetric intensification of heatwave-ozone compound extremes across China at 1 km resolution from 2000 to 2023
AU  - Yuxin Bi
AU  - Ruijun Xu
AU  - Yi Zheng
AU  - Nongping Feng
AU  - Jing Wei
AU  - Sirong Wang
AU  - Lu Luo
AU  - Jinying Huang
AU  - Kaiwen Zuo
AU  - Qiling Wang
AU  - Xinzong Zhang
AU  - Ziquan Lv
AU  - Suli Huang
AU  - Xue-Yan Zheng
AU  - Hong Sun
AU  - Ronghai Deng
AU  - Yuewei Liu
PY  - 2026
DA  - 2026/09/01
JO  - Environmental Science and Ecotechnology
DO  - 10.1016/j.ese.2026.100761
UR  - https://doi.org/10.1016/j.ese.2026.100761
AB  - Compound heatwave and ozone pollution events threaten public health as warming and photochemistry intensify. Yet the internal architecture of these events—how heatwaves and ozone separately influence frequency versus intensity—remains poorly resolved at national scale. Here we show, using 1 km resolution grids across China from 2000 to 2023, that heatwaves dominate the frequency of compound extremes while ozone dominates their intensity, and that this asymmetry strengthened after 2016. Population exposure rose primarily because the events themselves intensified, rather than from population growth. City-level influencing factors proved highly heterogeneous, reflecting local combinations of meteorology, pollution and socioeconomic conditions. These findings uncover an asymmetric architecture of compound risk and identify distinct levers—heat versus ozone—for targeted mitigation under continued warming.
SN  - 2666-4984
ER  -