Unraveling the potential of urban greenery for extreme heat and ozone mitigation in Northern Hemisphere cities

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ID: 325158
2026
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Abstract
Abstract Escalating exposure to extreme heat and ozone (O3) pollution has emerged as a principal challenge for cities worldwide. While urban greening is widely advocated for mitigating extreme heat, its impacts on compound heat-O3 pollution remain poorly understood due to intricate urban meteorology-chemistry coupling. By integrating observations, reanalysis data, and urban-land-atmosphere modelling, we demonstrate that urban greenery provides a notable yet uneven cooling effect of − 0.26 to − 1.08 °C in Northern Hemisphere’s metropolises, shaped by greenery fractions and local climate. Furthermore, the nonlinearly weakened O3 photochemical production within a greenery-stabilized urban boundary layer is capable of decreasing O3 in populated city centers. Despite the dual positive effects in alleviating heat and O3 exposures meteorologically, greenery-boosted biogenic emissions could chemically raise urban O3 by over 7.6 µg/m3 via supplementing precursors. These findings underscore the need to incorporate fully coupled urban meteorology–chemistry interactions in urban greening strategies to achieve climatic and environmental co-benefits.
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Authors Mengmeng Li, Yuting Lu, Xin Huang, Hui Zhang, Zilin Wang, Yue Qin, Jun Ge, Xueyu Zhou, Wei Wang, Wenjie Wang, Nan Wang, Tijian Wang, Minghuai Wang, Haishan Chen, Aijun Ding
Journal national science review
Year 2026
DOI
10.1093/nsr/nwag494
URL
https://doi.org/10.1093/nsr/nwag494
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