1.Total suspended particulate matter. No person may discharge total suspended particulate matter to the ambient air in an amount or concentration that soils property or creates a nuisance condition. Total suspended particulate matter concentrations of less than 150 micrograms per cubic meter for any 24-hour period in the ambient air are presumed not to constitute soiling or nuisance conditions. Any person who demonstrates on the basis of total suspended particulate ambient air quality monitoring information acceptable to the commissioner that emissions discharged by that person have not substantially caused or contributed to total suspended particulate matter concentrations in excess of 150 micrograms per cubic meter over a 24-hour period at any applicable location may not be held in violation of this subsection. [1989, c. 155, §2(NEW); 1989, c. 890, Pt. A, §40(AFF); 1989, c. 890, Pt. B, §167(AMD).]