Motorists across the UK are being warned to remove aerosol cans, such as deodorant, from their vehicles immediately as a heatwave sweeps the country, with temperatures inside parked cars potentially reaching 50°C and causing pressurised containers to explode.
Heatwave Triggers Warnings
The Met Office has issued heat-health alerts for parts of the UK, predicting unusually high temperatures that could push vehicle interiors well beyond safe limits when parked in direct sunlight. Experts warn that the temperature inside a car can rise rapidly in hot weather, often exceeding 50°C even when outside temperatures are significantly lower.
Risk of Explosion and Fire
According to the Health and Safety Executive, aerosols are classed as pressurised containers and should be kept away from heat and direct sunlight, as rising internal pressure can lead to leaks, rupture, or in rare cases, explosive failure. The concern is heightened by the fact that many aerosol products contain flammable propellants, meaning any breach of the container in a confined space like a car could also increase fire risk.
The UK Health Security Agency has repeatedly warned that vehicles can quickly become hazardous environments during heatwaves, advising the public to avoid leaving heat-sensitive items inside parked cars for prolonged periods.
Other Items at Risk
Motoring organisations also warn that a range of everyday items, including electronics, lighters, and sunscreen, can be affected by extreme heat, but aerosols are particularly singled out due to their pressurised nature. Drivers are being told to check their vehicles carefully before leaving them in the sun, including glove compartments, door pockets, and rear seats, to ensure no potentially hazardous items are left behind during the hottest parts of the day.
Simple Precautions
As the heatwave intensifies, officials say awareness of in-car temperatures is becoming a growing safety concern, with simple precautions—such as removing aerosol cans and other pressurised items—helping to reduce risks during short stops and longer parking periods in direct sunlight.
