SCR-equipped trucks normally come equipped with diesel particulate filters (DPF). The combination of technologies reduces harmful greenhouse gases including:
Meeting the EPA 2010 emissions standards will effectively reduce emissions to near-zero levels, requiring that PM be reduced to 0.01 g/bhp-hr (grams per brake horsepower-hour) and NOx be reduced to 0.20 g/bhb-hr. SCR is one of the only emissions control technologies that can achieve NOx reductions in excess of 90%. By helping the engine to work more efficiently and reducing the fuel needed to operate, SCR helps to reduce CO2 by as much as 5%.