Greenpeace used thermal cameras on July 11 to document extreme temperature variations across Paris during an exceptional heatwave [1].
The data highlights the danger of urban heat islands, where built environments absorb and radiate heat far more than natural spaces. This disparity creates significant health risks for residents, particularly children who utilize public play areas.
During the survey, the organization recorded a surface temperature of 70°C on a slide [1]. Such high temperatures on playground equipment can cause immediate burns to skin. The findings illustrate how synthetic materials in the city center can become hazardous during peak summer heat.
In contrast, the thermal imaging showed a significant cooling effect in areas with vegetation. Temperatures measured under trees remained at 24°C [1]. This gap of 46 degrees underscores the critical role of urban forestry in mitigating heat stress.
Greenpeace said the campaign aims to denounce the lack of adaptation in the French capital. The organization used the visual evidence to alert the public and city officials about the sanitary risks associated with these heat islands. By contrasting the extreme heat of metal and plastic with the coolness of shaded areas, the group said that the current urban layout is insufficient for rising global temperatures.
The campaign focused on the vulnerability of the youngest citizens. Because children are more susceptible to heat-related illnesses and burns, the group said the current state of public parks is an urgent concern. The organization is calling for more aggressive urban greening to protect public health during future heat events [1].
“Temperatures measured on a slide reached 70°C.”
The stark contrast between 70°C surfaces and 24°C shaded areas demonstrates that urban heat is not uniform but depends heavily on material and vegetation. This suggests that 'green infrastructure' is not merely an aesthetic choice but a necessary public health intervention to prevent injuries and heatstroke in densely populated cities.
