For information on the Tier 2 and Tier 3 programs and gasoline sulfur standards, see Gasoline Sulfur.
- For further information on the Tier 2 standards, contact David Good: 734-214-4450, firstname.lastname@example.org
- For questions on fuels registration, reporting and compliance, contact the EPA Fuels Program.
For information on sulfur and diesel fuel:
Clean Diesel Fuel Alliance Information Center: Answers to Frequently Asked Questions About Ultra Low Sulfur Diesel (ULSD) fuel.