Is it safe to sleep in the car with the air conditioning on and windows slightly open?

[McMakayla]

When using the air conditioning in the car, it is advisable to slightly open the sunroof or side windows to maintain air circulation. Additionally, alternating between internal and external air circulation modes is recommended. After running the car's air conditioning in internal circulation mode for 30 to 60 minutes, switch to external circulation mode for 10 minutes to allow fresh air from outside to replenish oxygen. Additional information: 1. Hazards of sleeping in the car with air conditioning on: If the air conditioning is only set to internal circulation mode in an enclosed space, the air inside the car circulates internally without being refreshed, leading to an increasing concentration of carbon monoxide inside the vehicle. Simultaneously, the occupants exhale large amounts of carbon dioxide, causing a rapid decrease in oxygen levels inside the car, which can result in nausea, unconsciousness within a few hours, and in severe cases, even death by suffocation. 2. Precautions for sleeping in the car: Regularly check for exhaust pipe leaks and ensure windows are properly sealed. Carbon monoxide from the vehicle's exhaust can enter the car and accumulate, raising the carbon monoxide levels inside and leading to poisoning. If the windows are not well-sealed, carbon monoxide can enter the car, which is also why keeping windows closed is important.