Temperature difference causes car odor to become more noticeable in winter

Didi Chuxing pointed out that the main reason why the odor in the car is more obvious in winter is the contrast in odor perception caused by the temperature difference between the inside and outside of the car. The car's heating system can make the temperature difference between the inside and outside of the car reach dozens of degrees, making the odor molecules inside the car more active than the odor molecules outside the car, making the odor inside the car appear stronger.