Switching air-recirculation mode on/off via the multimedia system
Requirements:
Vehicles with fine particle prefilter
Press 
on the upper display area of the climate bar.
on the upper display area of the climate bar. The interior air will be recirculated.
Air-recirculation mode will automatically switch to fresh air mode after a while.
If air-recirculation mode is switched on, the windows may mist up more quickly. Switch on air-recirculation mode only briefly.