Comments to Congress on the Proposed EPA Particulate Matter Standard
On behalf of the National Stone, Sand & Gravel Association (NSSGA), the National Ready Mixed Concrete Association (NRMCA) and the Portland Cement Association (PCA), we write to you today regarding our deep concern over the proposed Environmental Protection Agency (EPA) particulate matter (PM) standard that is expected to lower the National Ambient Air Quality Standard (NAAQS) particulate matter standard (PM 2.5) from its current level of 12.0 micrograms per cubic meter of air (µg/m3) to within the range of 8.0 to 11.0 µg/m3.