The White House Office of Management and Budget received for interagency review the Environmental Protection Agency’s proposed rule setting Tier 3 vehicle and gasoline standards under the Clean Air Act January 29. The agency plans to propose the rule in March, with a final rule expected by the end of the year. If the rule is made final by the end of the year, the standards are expected to take effect for model year 2017 vehicles, limiting the sulfur content in gasoline to 10 ppm.