The Environmental Protection Agency is planning to unveil a proposal that aims to clean up gasoline and automobile emissions, a plan officials say will lead to cleaner air but also higher gas prices.
The so-called Tier 3 standards would reduce sulfur in gasoline by more than 60 percent and reduce nitrogen oxides by 80 percent, by expanding across the country a standard already in place in California. It would go into effect in 2017.
The oil industry, Republicans and some Democrats have pressed the EPA to delay the rule, saying it would be unwise to impose such a standard while many are still struggling in a bad economy. An oil industry study says the rule could increase gasoline prices by 6 to 9 cents per gallon.