Powerful UK wrote:

Just one point i wanted to add is that the carbon filter does help absorb odours that may arise from in the cabin for example if you have dogs or don't use the car for periods of time.

Hope this helps

Simon

How? Recirc air doesnt go though the pollen filter - the only air that goes through it is outside air... Once its incide it can be as stale as it wants. 

Also maybe stop "entertaining" or "exercising" in the car will stop it steaming up.
Kidding!

I guess if it was on an Audi Q7 it would be mostly due to the driver breathing through his mouth!