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Asymmetric global urban cooling potential demands accelerated and context-specific actions
Xiaotian Ding1,2,3,4, Yifan Fan5,6,7, Yongling Zhao8
1Department of Architecture, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China.
Nature Communications
|March 20, 2026
Summary
Urban heat mitigation strategies can reduce extreme heat, but effectiveness varies globally. Low-latitude cities need tailored approaches for nighttime cooling to combat rising heat danger hours.
Area of Science:
- Urban Climatology
- Environmental Science
- Public Health
Background:
- Rising urban temperatures and heat extremes present a significant global challenge.
- The potential for mitigating excessive urban heat at a global scale is not well understood.
Purpose of the Study:
- To quantify the cooling potential across 2,265 cities worldwide by the 2050s.
- To assess the effectiveness of combined mitigation strategies (reflective surfaces, green transformation, anthropogenic heat reduction) on reducing heat risk.
Main Methods:
- Utilized validated urban climate simulations to model cooling effects.
- Quantified reductions in summer average wet-bulb globe temperature (WBGT) and heat danger hours (HDH; WBGT > 31.4°C).
Main Results:
- A distinct spatial asymmetry in cooling potential was observed, increasing with latitude.
- Highest heat risk is concentrated in low- to mid-latitude regions (10°N-40°N).
- Combined mitigation reduced nighttime heat danger hours by an average of 37% in high-risk regions, with only 11% reduction in daytime heat.
Conclusions:
- Context-specific strategies are crucial, particularly for low-latitude humid regions.
- Accelerated action and localized innovation are needed for effective urban heat mitigation.
- Integrating city-scale planning with targeted daytime heat risk interventions is essential.
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