How Long Can You Stay in a Car Without Opening the Windows?

[SanAngela]

Sleeping in a car without opening the windows is definitely not advisable and can sometimes be dangerous, even fatal in extreme cases. Here is the relevant information: Principle: With advancements in manufacturing, modern vehicle doors and windows have excellent sealing properties. The confined space inside the car becomes airtight, making it difficult for air to exchange between the inside and outside, even when parked in an open outdoor area with good airflow. As a person continuously consumes oxygen and exhales carbon dioxide, the oxygen level decreases while the carbon dioxide concentration rises. When the carbon dioxide level reaches around 6%, there is a risk of death due to oxygen deprivation and carbon dioxide poisoning. Precautions: Use the air conditioning in recirculation mode; park the car in a well-ventilated area; avoid staying in the car for long if the outside temperature is unsuitable, such as during hot summer days with direct sunlight.