The U.S. Environmental Protection Agency is set to unveil new federal standards today for cleaner gasoline and vehicles. The rules will reduce sulfur in gasoline by two-thirds and impose pollution limits on all cars by 2017. The Obama administration says the standards will be equal to taking 33 million cars off the roads. They have been held up for well over a year amidst political opposition led by oil industry lobbyists. At least 16 congressional Democrats have signed on to a Republican demand for the rules to be delayed.