Due to growing concerns about NO_x and particulate matter (PM) emissions from diesel engines, stricter regulations are being introduced requiring advanced emission control technology. In response the diesel industry has begun testing various emission control technologies and applying them. To assess vehicle renewal policies of bus companies, two exhaust after-treatment technologies are compared: the combination of a diesel par-ticulate filter and an exhaust gas re-circulation system and the combination of a selective catalytic reduction and urea. Onboard emission measurements were conducted under real-world driving conditions on a specific bus route in the city of Madrid.
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