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Nighttime heat is rising rapidly in 83% of major cities, threatening health and exposing flaws in current heat warnings.
A new global study finds dangerous nighttime heat is rising in 83% of 100 major cities analyzed, with nighttime temperatures increasing up to 10 times faster than daytime highs during extreme heat events from 1994 to 2024.
The research highlights shrinking day-night temperature gaps, especially in dry and moist tropical regions, making heat more oppressive and persistent.
Cities like Melbourne and Dubai saw rapid nighttime warming, while Europe, the Middle East, and parts of Asia experienced reduced nighttime cooling.
The study warns that rising overnight heat disrupts sleep, hinders recovery, and increases health risks, particularly for vulnerable groups.
Current heat warnings, focused on daytime highs, fail to address this growing threat, prompting calls for 24-hour heat response strategies and updated urban and public health policies.
El calor nocturno está aumentando rápidamente en el 83% de las principales ciudades, amenazando la salud y exponiendo defectos en las advertencias de calor actuales.