I currently drive by a refinery, on the River Rouge, Detroit. Eh Gads, what a smell!! I do use the recirculating setting but tend to forget to reset it to the outside setting, once past the refinery. By not resetting the air flow, the car begins to get foggy/stuffy, (heater, setting only, not air conditioning), so if you could use a auto setting, GPS based and include a icon to let you know it is running.
Good idea. I can think of at least one other condition which would involve a preconditioning scenario in either a familiar or unfamiliar location such that you would not like the outside air circulated inside the vehicle..