ULSD 500 PPM

Ultra-low-sulfur diesel (ULSD) is diesel fuel with substantially lowered sulfur content. As of 2006, almost all of the petroleum-based diesel fuel available in Europe and North America is of a ULSD type.
ULSD has a lower energy content due to the heavy processing required to remove large amounts of sulfur from oil, leading to (1 to 2%) lower fuel economy. Using it requires more costly oil.
In the European Union, the �Euro IV� standard has applied since 2005, which specifies a maximum of 50 ppm of sulfur in diesel fuel for most highway vehicles; ultra-low-sulfur diesel with a maximum of 10 ppm of sulfur must �be available� from 2005. A final target (to be confirmed by the European Commission) of 2009 for the final reduction of sulfur to 10 ppm, which considered the entry into force of the Euro V fuel standard.