Since 1990, the European Union (EU) has been introducing increasingly drastic reductions to emissions standards. The Euro 4 standard was superseded by Euro 5 in October 2009. Australia has also followed suit with the introduction of the current Euro 4 (ADR 80/02) emission standard in January 2008. The next level of emission standard, Euro 5 (ADR 80/03) will be introduced in January 2011.
At present Mercedes-Benz Trucks in Australia offers both the current Euro 4 emission standard and the future Euro 5 emission standard in all of it's heavy commercial vehicles.