Patti
As for the Moler environmental restrictions, The zoning in that area is virtually non-existant. Farmers probably generate as much dust. The agency that enforces environmental code in that county has about 2 employees and is primarly trained in septic systems. If you want to spend some time reading what restrictions could possibly be done as far as air quality standards you can start reading here. http://www.epa.gov/air/oaqps/greenbk/40cfr50.html#appk
I would also think that OSHA would have some standards pertaining to dust.