Berlin police deployed two water cannons to spray a cooling mist over city streets during an extreme heatwave on 15 July 2024 [1], [2].

This unconventional use of crowd-control equipment highlights the increasing pressure on urban infrastructure to protect citizens from record-breaking temperatures. As heatwaves become more frequent, cities are forced to adapt existing resources to prevent heat-related medical emergencies.

The deployment occurred as the city faced the first major heatwave of the year, with temperatures peaking at approximately 38 °C [3]. The police utilized the vehicles to provide immediate relief to pedestrians navigating the city center, a tactical shift from the cannons' typical role in managing protests.

"We are using water cannons to create a fine cooling mist for pedestrians on the streets," a Berlin police spokesperson said [1].

The city administration viewed the extreme weather as a significant public safety risk. Mayor Franziska Giffey said the response was necessary given the unusual timing of the temperature spike.

"The heatwave is unprecedented for this time of year, and we are taking all possible measures to protect the public," Giffey said [2].

The operation focused on high-traffic pedestrian areas where the urban heat island effect often amplifies the temperature. By deploying two units [1], the police were able to create localized zones of relief for residents, and tourists alike.

This response follows a growing trend of European cities implementing emergency cooling measures to mitigate health risks associated with extreme heat. The use of water cannons for misting is one of several improvised strategies being tested to ensure public safety during climate anomalies.

“"We are using water cannons to create a fine cooling mist for pedestrians on the streets."”

The repurposing of riot control equipment for public health relief indicates a gap in permanent urban cooling infrastructure. While the immediate effect provides relief, the reliance on police resources suggests that Berlin and similar cities may need to invest in dedicated permanent misting systems and green architecture to handle the rising frequency of extreme heat events.