Sulfur and benzene are under a cap-and-trade federal compliance program https://www.epa.gov/gasoline-standards/gasoline-sulfur-benzene-credits https://www.epa.

Sulfur and benzene are under a cap-and-trade federal compliance program https://www.epa.gov/gasoline-standards/gasoline-sulfur-benzene-credits https://www.epa.gov/gasoline-standards/gasoline-sulfur-benze... Has been very successful in reducing sulfur in road fuel down to <10ppm. Not sure if it's possible to even move gasoline over 3.8% benzene today.