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Why is it dangerous to sleep in a car with the air conditioning on?

1 Answers

BriellaMarie

07/24/25 4:23pm

Sleeping in a car with the air conditioning on poses risks of carbon monoxide poisoning and carbon dioxide poisoning. The reasons are as follows: 1. When the car is idling, even outdoors, carbon monoxide can accumulate around the vehicle if there is no wind, and the concentration increases over time. If the car is set to external air circulation, the carbon monoxide outside can be drawn into the car in large quantities, leading to carbon monoxide poisoning. 2. If the windows are tightly closed and the air conditioning is set to internal circulation while sleeping for an extended period, the confined space of the car will cause oxygen levels to decrease due to human respiration, while carbon dioxide levels increase. When the carbon dioxide concentration reaches a certain level, it can cause unconsciousness and brain hypoxia, and in severe cases, even death. Best practices for using car air conditioning in summer: 1. Open the windows for ventilation after entering the car: After the car has been exposed to the sun, do not turn on the air conditioning immediately. First, open all four doors to ventilate and disperse toxic gases. 2. Turn on the fan after starting the car: After starting the vehicle, turn on the fan first without activating the air conditioning (do not press the A/C button). Let the fan blow out the contaminated air from the air conditioning system and also expel the hot air. 3. Use natural air for 5 minutes before turning on the air conditioning: After running the fan for 5 minutes, press the air conditioning button to activate the cooling function. Keep the windows open during this time. 4. Close the windows after 1 minute of air conditioning cooling.

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