Yes that was one of my biggest concerns too. Dust was everywhere except inside :).
Parts of the Dev (and Telegraph) roads were like fog after oncoming cars.
I used the "recycling air" function often to pressurise the cabin after every passing car. Its a shame it auto turns off after 15mins, would be nice to have a more permanent setting for these conditions.
Next time we go we will definitely try to avoid the crowds during school hols, so that should reduce the dust significantly (from others at least).

