Emission Standards: Europe: Heavy-Duty Truck and Bus …
Liming · These standards applied to both truck engines and urban buses, the urban bus standards, however, were voluntary. In 1999, the EU adopted Directive 1999/96/EC [2870], which introduced Euro III standards (2000), as well as Euro IV/V standards (2005/2008). This rule also set voluntary, stricter emission limits for extra low emission vehicles
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