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Automatic Air Recirculation

At Volkswagen, the air quality sensor is part of the "Climatronic" automatic air conditioning system. It measures pollutants, in the form of oxidisable or reducible gases, in the air outside your car. Oxidisable gases include carbon monoxide (CO), hydrocarbons (vapours from benzene or petrol) and other incompletely burnt fuel components. Nitrogen oxides (NOx) are reducible gases.
If the quality of the outside air drops – in a traffic jam or when driving through a tunnel, for example – the control system activates the Climatronic’s air recirculation mode, stopping polluted air from coming in and reducing the quality of air inside your car.