A group of Democratic senators on Thursday will urge the Obama administration to propose rules to cut smog-forming emissions from gasoline, regulations opposed by many Republicans.
The lawmakers, led by Senator Kirsten Gillibrand from New York, want the Environmental Protection Agency to propose rules that would slash the sulfur content in gasoline this year and to finalize them next year.
The rules, which had been expected to be proposed early in 2012, would require the sulfur content of gasoline to be cut to 10 parts per million, down from the current 30 ppm standard. Republican lawmakers have opposed the rules saying they would add costs to refiners and put jobs at risk.
The American Petroleum Institute, the main energy industry lobbying group, has said the rules could increase operating costs for refiners by up to 9 cents a gallon.