BP said the newly formulated fuel is expected to reduce vehicles' nitrous oxide emissions by about 4 percent.Nitrous oxide combines with volatile organic compounds and sunlight to produce smog.
"This is the equivalent of removing 2,100 cars off (interstate highway) I-5 every day," the company said in a news release.
The premium-grade gasoline will initially be sold at 145 ARCO stations in Washington. BP acquired ARCO last year.
As BP refineries convert their operations to produce additional lower-sulfur fuel, the company expects to have lower-sulfur gasoline available in all grades.
Current production is focused on serving major cities with air pollution concerns.
The U.S. Environmental Protection Agency has established federal limits aimed at reducing gasoline sulfur levels by 90 percent by 2006, but BP said its new lower-sulfur premium, with a sulfur content of 30 parts per million (ppm), meets the limits four years earlier.