EPA has finalized Tier 3 standards designed to reduce air pollution from passenger cars and trucks

Topic: EPA has finalized Tier 3 standards designed to reduce air pollution from passenger cars and trucks. The Tier 3 standards also lower the sulfur content of gasoline, considering the vehicle and its fuel as an integrated system. I would like you to research technologies OEM would use to meet Tier 3 standards. For this report pick just one technology that OEM could use. Please go in-depth on how it works and it's impact on emissions. Your must also express your impression regarding the potential impact of Tier 3 standards on the design of future Automobile. OEM stands for Original equipment manufacture.