Valérie Pécresse, president of the Île-de-France region, has urged residents to work from home as a severe heatwave disrupts public transport networks across Paris.
The call to action comes as temperatures soar, threatening to overwhelm the region's transit infrastructure and endanger commuters during peak hours.
The extreme weather is part of a broader crisis sweeping across Europe, marking the second intense heatwave in less than a month.
Authorities in both France and Belgium have been forced to implement emergency measures to cope with the rapid succession of high-temperature events.
Schools, colleges, and high schools in France are closing their doors for the start of the week to protect students and staff from the hazardous conditions.
This recurring pattern of extreme weather is testing the resilience of European infrastructure.