Firefighters are warning folks: don't leave aerosol cans in your car. Here's why

As temperatures rise, so does the risk of everyday items becoming hazardous. One such item that often goes unnoticed is the aerosol can. Firefighters across the country are sounding the alarm about the dangers of leaving these pressurized containers in vehicles, especially during the hot summer months.

While aerosol cans are convenient for a variety of uses, from personal care to cleaning products, they pose a significant risk when exposed to high temperatures. Understanding the science behind these cans and the potential dangers can help prevent accidents and ensure safety.

Aerosol cans are designed to dispense products in a fine mist or spray. They contain a product mixed with a propellant, which is typically a liquefied gas under pressure. This pressure allows the product to be expelled when the nozzle is pressed. The can itself is made from metal, usually aluminum or steel, to withstand the internal pressure.

The pressure inside an aerosol can is what makes it effective, but it also makes it potentially dangerous. Most aerosol cans are pressurized to about 2-8 times atmospheric pressure (29-116 psi). This pressure can increase significantly with rising temperatures, leading to the risk of explosion if the can is compromised.

Heat is a major factor that affects the pressure inside an aerosol can. When the temperature rises, the gas inside the can expands, increasing the internal pressure. According to the ideal gas law, the pressure of a gas is directly proportional to its temperature when volume is constant.

In a car, temperatures can soar to 130°F (54°C) or higher on a hot day, even if it's only 90°F (32°C) outside. This extreme heat can cause the pressure inside the can to exceed its safe limit, potentially leading to a rupture or explosion.

There have been numerous incidents where aerosol cans have exploded in vehicles, causing damage and injury. In one case, a can of hairspray left on the dashboard of a car exploded, shattering the windshield and causing burns to the driver. Another incident involved a can of deodorant that exploded in the glove compartment, igniting a small fire.

These incidents highlight the real danger posed by leaving aerosol cans in hot cars. The force of an exploding can can be significant, with metal fragments and the contents of the can posing additional hazards.

When an aerosol can explodes, it's not just the physical damage that poses a risk. The chemicals inside the can can be harmful if inhaled or if they come into contact with skin. Many aerosol products contain volatile organic compounds (VOCs) that can cause respiratory issues, skin irritation, and other health problems.

In the event of an explosion, these chemicals can be released into the air, creating a toxic environment inside the vehicle. This is particularly dangerous in enclosed spaces where ventilation is limited.

A variety of aerosol products are commonly found in cars, often for convenience. These include personal care items like deodorant and hairspray, cleaning products like air fresheners and glass cleaners, and even automotive products like tire inflators and lubricants.

While these products are useful, it's important to be aware of the risks they pose when left in a hot car. Even products that seem harmless can become dangerous under the right conditions.

Cars are particularly risky environments for aerosol cans due to their tendency to trap heat. The greenhouse effect causes the interior of a car to heat up quickly, especially when parked in direct sunlight. The lack of ventilation and the enclosed space exacerbate the problem, creating a pressure cooker effect.

Additionally, the materials inside a car, such as upholstery and plastics, can absorb and retain heat, further increasing the temperature and the risk of an aerosol can exploding.

In recent years, several viral hacks have circulated online, suggesting the use of aerosol products for unconventional purposes. For example, using a can of compressed air to cool down a car's interior or using spray paint for quick touch-ups. While these hacks may seem clever, they often ignore the safety risks associated with aerosol cans.

These hacks can increase the risk of explosion by encouraging the use of aerosol cans in ways they were not designed for, often in hot or confined spaces.

Firefighters recommend several precautions to minimize the risk of aerosol can explosions. First and foremost, avoid leaving aerosol cans in your car, especially during hot weather. If you must transport them, keep them in a cooler or insulated bag to reduce temperature fluctuations.

Firefighters also advise checking the labels on aerosol products for temperature warnings and following storage instructions carefully. Being proactive about safety can prevent accidents and ensure that these products are used safely.

There are several alternatives to aerosol products that can reduce the risk of explosion. For personal care, consider using roll-on or stick deodorants instead of sprays. For cleaning, opt for pump spray bottles or wipes that don't rely on pressurized gas.

These alternatives not only reduce the risk of explosion but also minimize exposure to harmful chemicals, making them a safer choice for both personal and environmental health.

Proper storage of aerosol cans is crucial to prevent accidents. Store them in a cool, dry place away from direct sunlight and heat sources. A temperature-controlled environment, such as a pantry or cabinet, is ideal.

Ensure that the cans are upright and not subject to physical damage. Regularly check for signs of rust or damage, and dispose of any cans that show signs of compromise.

If an aerosol can explodes in your car, prioritize safety. Exit the vehicle immediately and assess the situation from a safe distance. If there is a fire, call emergency services and do not attempt to extinguish it yourself unless you have proper training and equipment.

Once the situation is under control, ventilate the car to disperse any lingering fumes. Clean up any residue carefully, wearing gloves and protective gear to avoid chemical exposure. If in doubt, consult a professional cleaning service to ensure that all hazards are addressed.