What is this button in the car for?

When should it be activated? Specific situations

Here are the times when turning on air recirculation can be  really useful  :

• When you are driving in a very polluted area (for example:  traffic jams on the ring road )
• In the presence of bad odors outside (farm, treatment plant, etc.)
• When passing through a tunnel or very dusty area
• In summer, to increase the efficiency of air conditioning

In these cases, this allows you to  avoid letting polluted or unpleasant air  into your car. In this context, the button becomes your ally.