US refiners would need to lower the sulfur content of gasoline to levels in place in Europe and elsewhere under a Mar. 29 proposal by the Environmental Protection Agency aimed at aligning federal regulations with those in effect in California.
The agency’s Tier 3 regulations call for a reduction in gasoline sulfur content to 10 ppm from a present average of 30 ppm. They also call for cuts in vehicle tailpipe and evaporative emissions in a package EPA said would move federal requirements toward strict standards in effect in California.
The proposed sulfur limit matches that of “Euro 5” gasoline in Europe. EPA said its Tier 3 proposal “is harmonized with the California Air Resources Board Low Emission Vehicle program so automakers could sell the same vehicles in all 50 states.”