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Cities Brace for Record Heat: 25% Rise in Hot Days

10/1/2025

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Summary

Story summary

Major cities face 25% more extremely hot days than in the 1990s, IIED.
The average days above 35°C rose from 1,062 (1994-2003) to 1,335 (2015-2024).
In 2024, nine cities, Washington, D.C., and Tokyo, saw unprecedented heat.
Urban growth raises vulnerability, especially in low-income areas; adaptation via building design and green spaces is urged, with a Global Center on Adaptation campaign.

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Story summary

Major cities face 25% more extremely hot days than in the 1990s, IIED.
The average days above 35°C rose from 1,062 (1994-2003) to 1,335 (2015-2024).
In 2024, nine cities, Washington, D.C., and Tokyo, saw unprecedented heat.
Urban growth raises vulnerability, especially in low-income areas; adaptation via building design and green spaces is urged, with a Global Center on Adaptation campaign.