The preliminary investigations indicated that the deaths were caused by inhalation of carbon monoxide (CO) emitted from the vehicle while its engine was running.
How to prevent CO poisoning in a vehicle
Never leave your vehicle running in an enclosed or partially enclosed space.
Make sure the tailpipe is clear of debris.
Have your vehicle's exhaust system and engine serviced once a year by a qualified mechanic to check for leaks.
Consider buying a portable, low-level CO detector for your vehicle.
If you have a keyless ignition car, double-check that the engine is off when you leave the vehicle.
Do not nap in your vehicle or use a vehicle to cool down while it is running.
If you have symptoms, open the windows, pull over safely, and get fresh air.
What is Carbon Monoxide (CO) poisoning
According to the US Centre for Disease Control and Prevention (CDC), Carbon monoxide (CO) is an odorless, colorless gas that kills without warning.
Carbon monoxide poisoning occurs when carbon monoxide builds up in the blood. When too much carbon monoxide is in the air, carbon monoxide replaces oxygen in the red blood cells. This can lead to serious tissue damage or even death.
Many household items produce this poison gas.
The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. CO symptoms are often described as flu-like.
CO is found in fumes produced from burning fuel in cars or trucks, small engines, stoves, or gas ranges.
CO can build up indoors and poison people and animals who breathe it. However, you can reduce your risk of CO poisoning with a few small steps.
Make sure gas appliances are vented properly. Horizontal vent pipes for appliances, such as a water heater, should go up slightly as they go toward the outdoors, as shown below. This prevents CO from leaking if the joints or pipes aren't fitted.
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