(a) Concentration of suspended particulates is determined by the Federal reference methods found in 40 CFR part 50 appendices J, K and L (See Table 1, section 200.9 of this Title) or another method acceptable to the commissioner. Specifications for equipment and filter media shall conform to standards acceptable to the commissioner.

(b) Concentration of settleable particulates or dustfall is determined gravimetrically by the collection of the settleable particulate in a vessel with a defined surface area reported as cm². The results are expressed as miligrams of settleable particulate per square centimeter per month (mg/cm²/mo).