Abstract
One-third of the passenger cars in Sweden today are certified with current state-of-the-art emission control technology. For gasoline-fueled vehicles this involves, for example, closed-loop three-way catalyst control technology. From now on light-duty and heavy-duty trucks and buses also need to be certified against stringent emission requirements. The enforcement program is run to check the equipment's ability to meet the requirements in use and if the manufacturer is meeting their responsibility. The Conformity of Production Audits have shown some of the emission control systems to be preferable and others less so. The In-Use Compliance testing is forcing durable emission control systems. Tests thus performed have revealed potentials to meet lower emission levels than currently required. Urgent need to further cut emissions has guided the Swedish Parliament to adopt a tax incentive scheme with voluntary emission requirements. The manufacturer may chose to certify against a set of more stringent emission standards, and get a lower sales tax on the vehicle. By this scheme the use of USA/California ‘tier 1’ and ‘Low-Emission’ light vehicles and low-emitting heavy-duty vehicles will be encouraged.
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