fisherman65 - I don't know about others but when I apply DE to the pine shavings, there is so little that you barely see it. I use coarse, large pine shavings and when they burrow in it or scratch in it, I do not have a dust storm of DE in the air. That's all I can tell you. Plus I have so much ventilation that any dust in the air is moved out of the coop almost immediately.