Should You Use the Internal or External Air Circulation in a Car?

[VanJameson]

Whether to use internal or external air circulation depends on the situation. Here is the relevant information: 1. Internal air circulation in a car: The main purpose of internal circulation is to promptly and effectively prevent external dust and harmful gases from entering the vehicle. When driving through areas with smoke, dust, unpleasant odors, or in heavy traffic, it blocks harmful exhaust emissions from the vehicle ahead. Another function is to maintain warmth inside the car. 2. External air circulation in a car: This allows you to breathe fresh air from outside. During long drives on highways, if the air inside the car becomes stuffy and uncomfortable and you cannot open the windows, you should use the external circulation to let in some fresh air. In winter, if the warm air feels too hot, you can turn off the fan and switch to external circulation, which maintains the interior temperature while providing fresh air, making you feel more comfortable.