On Friday, the Environmental Protection Agency finallyproposed a new set of regulations — known as Tier 3 Vehicle Standards. The rules would reduce the amount of sulfur present in gasoline before our cars burn it. It brings the rest of the country in line with the environmental standards that have regulated California’s automobile industry for years.
Cutting back on the use of sulfur in gasoline by two thirds will have indirect environmental and public health benefits. While sulfur dioxide is not itself a greenhouse gas, reducing the amount of sulfur in gasoline will increase the efficiency of catalytic converters, reducing emissions and gasoline consumption. (Video explanation of how catalytic converters pull pollutants out of engine exhaust before it hits the air.)
WASHINGTON — The Obama administration is expected to propose new rules Friday that would slash the amount of sulfur in gasoline, one of the most significant steps the administration can take this term toward cutting air pollution, said people with knowledge of the announcement.
The new rules would bring the rest of the country’s sulfur standards in line with California’s gasoline program.
The oil industry and members of Congress from oil states have criticized the standards as onerous with few health benefits in return. Environmentalists have countered that the rules would improve public health considerably.