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Modeling and Inventories

Ultra-Low Sulfur Gasoline Emissions Study

NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.

Understanding the effects of gasoline sulfur level on the in-use fleet is important for assessing emissions inventories and impacts of future policy decisions. This study recruited 93 Tier 2 cars and light trucks from owners in southeast Michigan, covering high-sales vehicles of model years 2007-9 with approximately 20,000-40,000 odometer miles. Test fuels were two non-ethanol gasolines with properties typical of certification fuel, one at a sulfur content of 5 ppm and the other at 28 ppm (representative of retail fuel in the recruiting area). Emissions for gaseous and particulate matter were measured over the Federal Test Procedure. Program design, data collection, and statistical analyses are described in the study report. The study database linked below contains vehicle, fuel, and emissions data used to perform the analyses. There is also a link to documents describing the independent peer review of the draft study report.

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