Heidi, it's pretty common in the spring, summer and fall. And of course we have to deal with smoke from fires in summer as well. No, it's not good to drive in weather like this. Not only is it dangerous because it can push you off the road but like you said it sandblasts the windshield and paint.
I can't imagine what it would have been like to live in Oklahoma in the 20s, 80TAPaceCar. I've read accounts of it, absolutely terrifying.