What does AQS in cars mean?

[CoraFitz]

AQS (Air-Quality-System) is an air quality sensor in cars, an automatic device that can sensitively detect the turbidity and humidity of the outside air and promptly switch the car's air circulation between internal and external modes. Here is the reaction sensitivity of AQS to different pollutants: 1. Advantages of AQS: AQS is highly sensitive to vehicle exhaust. For example, during traffic congestion in urban areas, if the vehicle ahead suddenly emits a large amount of exhaust, the intelligent air conditioning system can detect it within seconds and immediately switch to internal circulation mode, ensuring the cabin air remains fresh. 2. Limitations of AQS: AQS has a moderate response to road dust. When driving on roads with light dust, AQS will not switch immediately; it only switches to internal circulation mode when the road dust becomes severe. This is why frequent cleaning of the air filter is necessary for vehicles often driven on sandy or dusty roads. AQS also reacts slowly to colorless harmful gases.