The EPA is proposing a new National Ambient Air Quality Standard (NAAQS) for coarse particulate matter (PM_c). The proposed PM_c NAAQS is in the range of 70μg/m³ to 85μg/m³. There are two regulatory uses of NAAQS. One is to determine whether an area is in attainment and the second is a limit on the fence line (property line) concentrations. The second use of the NAAQS which is to limit concentration at the property line can be extremely detrimental to agricultural operations. The proposed method for determining PM_c concentrations is by subtracting FRM PM_2.5 concentrations from FRM PM₁₀ concentrations. This method is referred to as the "difference" method. This method includes a large bias since the bias associated with the measurement of PM_c concentrations is a combination of the bias from the concentration measurements associated with PM_2.5 and PM₁₀. Some gins may exceed the PM_c NAAQS at the property line. Cotton gin particulate matter is relatively large with a mass median diameter (MMD) in the range of 18μm with a geometric standard deviation (GSD) of 2.0. This paper will address problems associated with meeting air pollution regulatory problems associated with enforcement of PM_c NAAQS.