What does AQS in cars mean?

[MadelynDella]

Automotive AQS is an air quality module, an automatic device capable of sensitively detecting the turbidity and humidity of the outside air and promptly switching between air recirculation and fresh air modes. AQS is highly sensitive to vehicle exhaust. For instance, 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 the recirculation mode, ensuring the cabin remains filled with fresh air. AQS has a moderate response to road dust. When driving on roads with light dust, AQS will not switch immediately. It only rapidly switches to recirculation mode when the road dust becomes severe. This is why frequent cleaning of the air conditioning filter is necessary for vehicles often driven on sandy or dusty roads.