NRMCA Producer member Delaware Valley Concrete is working with Greater Philadelphia Clean Cities to introduce concrete mixers powered by compressed natural gas (CNG). Delaware Valley Concrete says it will diminish its carbon footprint by reducing its reliance on petroleum consumption. As both a local and national environmental trend, natural gas has significant environmental benefits versus diesel, including quieter operation, an 80 to 90 percent lower decibel level than comparable diesel trucks; a reduction in carbon monoxide up to 80 percent; and a reduction in nitrogen oxide up to 85 percent.