This sounds like a really stupid question - but air conditioning in cars - it is presumably just drawing in the air from outside and cooling it down, so allergens will end up in the car?
I'm driving in a new country, and am struggling, especially when sitting in the front near the air con. Am I going mad, or is that plausable? I'm crossing big distances, going quite quickly through very changing landscapes.
I'm not sure what to do... it's somewhat unavoidable, but I'm living on Ventolin much more than normal.