Living on a Busy Street

I live on the corner of a very busy street; it is a major east/west through way here in Tampa. When our neighborhood started out in the late teens, it was still considered a main street, but much, much smaller and nowhere near as busy (how fast could they go on a sea shell paved road?). I find the aspect of this location that bothers me the most is not the noise (except maybe the sirens), not the lack of privacy and not the street people coming up to us offering to do work for money, or just flat out asking for money; I knew all this when we bought the house. What bothers me the most here is the road dirt. If you live close enough to a busy street you may know what I mean-it's a fine, black dusty dirt which blankets everything, particularly noticeable on the front porch. We have to hose the porch off weekly, but even then, it does not completely go away. It clings to feet and travels inside, even with a door mat out front. I suspect the dirt is composed of tire/rubber dust and brake dust. It makes my white window trim black, and is a B**CH to get off, the water only moved the top layer, the rest clings. It makes it hard to enjoy the front porch, although we usually do...we just make sure we're not in our "good clothes" while we are sitting out there. I wonder how many other people are dealing with this...or maybe we are just in a "special" spot which receives the brunt of the dirt. Who knows?