Starting in 2008, new diesel trucks were required by the EPA to include an EGR (exhaust gas recirculation system), which routes exhaust back into the combustion chamber to reduce temperatures, a DPF (diesel particulate filter), which traps and burns soot and ash particles, and a diesel nitrogen oxide filter, that reduces harmful tailpipe fumes. These tightening emission standards sought to curb not only unhealthy smog, but also reduce incidents of cancer and other health concerns, which diesel engine emissions
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