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Aftertreatment systems clean and remove particles and gases from the exhaust to meet the emissions standards. The system can include a diesel particulate filter (DPF), diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR) system to remove particulate matter and soot, unburnt hydrocarbons and nitrous oxides. Perkins aftertreatment and diesel engines are integrated systems, designed and built specifically for optimum fuel economy, performance and to meet emissions standards.