Mack Trucks Inc will use a combination of proven exhaust gas recirculation (EGR) technology and selective catalytic reduction (SCR) to satisfy the nitrogen oxide (NOx) portion of the federal diesel engine emissions regulations scheduled to take effect in 2010.
The 2010 regulations, developed by the United States Environmental Protection Agency (EPA), call for NOx emissions levels to be reduced more than 80% from the standard set to take effect in January 2007.
The base engines for Mack's 2010 system will be its MP series, which use High-Performance Exhaust Gas Recirculation (HEGR) to meet current and 2007 NOx standards.
Mack also confirmed that its EPA '10 system will feature the diesel particulate filter being deployed for 2007, as the required particulate matter emissions levels remain the same for 2010.
SCR is an aftertreatment system that involves injecting a liquid urea solution into the engine exhaust stream to break down NOx. Manufactured primarily from natural gas, urea is a readily available, soluble nitrogen-based compound widely used in agricultural fertilizers and considered a non-hazardous substance by the EPA.