I second the use of a respirator. I have horrible allergies and everytime I mow, blow leaves, or do anything involved with dust outside I wear one. I just went and bought a different one with a charcoal based filter because it keeps the diesel smell out and I don't have to worry about breathing that either. I can sometimes get into some pretty thick dust clouds, usually not with mowing but with leaf blowing, and I don't have a problem.