U.S. proposes states set their own tailpipe emissions targets


WASHINGTON — The U.S. Transportation Department on Thursday announced it is proposing to require that state transportation agencies set new targets for reducing tailpipe emissions on the national highway system.

The department’s Federal Highway Administration told Reuters states will have flexibility “to set targets that work for their respective climate change policies and other policy priorities, so long as they are in line with the net-zero goals by 2050 set forth in this rule.”

President Joe Biden has set a U.S. target of achieving a 50-52 percent reduction from 2005 levels of economy-wide net greenhouse gas pollution in 2030 in a step toward reaching net-zero emissions economy-wide by no later than 2050.

States would also be required to report on their progress in meeting the targets under the proposed rule. Currently, state laws require 24 states and the District of Columbia to set targets and track their greenhouse gas emissions. Reuters reported the planned rule earlier.

Transportation Secretary Pete Buttigieg said the “approach gives states the flexibility they need to set their own emission reduction targets.”

He noted that a $1 trillion infrastructure bill approved in November created a $6.4 billion Carbon Reduction Program to provide state and local funding to “develop carbon reduction strategies and fund a wide range of projects designed to reduce carbon emissions from on-road highway sources.”

The proposed rule faces opposition amid ongoing debates about how much power agencies can wield over environmental regulations without congressional approvel.

U.S. Sen. Shelley Moore Capito, R-W.Va., criticized the proposed rule and said it lacks authorization from Congress.

In the infrastructure law enacted last year, “Congress included provisions to address climate change and the resiliency of transportation infrastructure in a bipartisan way. This greenhouse gas performance measure announced was not part of that legislation,” she said in a statement Thursday.

“Unfortunately, this action follows a common theme by both DOT and the administration, which is implementing partisan policy priorities they wish had been included in the bipartisan bill that the president signed into law.”

A spokesperson for the Federal Highway Administration said Congress gave the agency the authority to establish measures that state transportation departments can use to assess the performance of the interstate and non-interstate national highway system, including the authority to require states to set goals and track their progress but not to impose consequences.

The agency is not proposing penalties or other enforcement actions, the spokesperson said. But if a state transportation department fails to make “significant progress” toward its emissions target, then it would need to document actions it would take to achieve the target in its next biennial report, they explained.

The transportation sector accounts for the largest source of U.S. emissions. The rule seeks “standardizing practices that many states have already established economy-wide, by making data comparable across states lines and metropolitan areas, and by facilitating better planning and outcomes for local communities.”

State transportation agencies would establish two- and four-year statewide emissions reduction targets.

The Environmental Protection Agency said last month it plans to propose new, more stringent vehicle emissions rules through at least the 2030 model year by the end of March.

In December, the EPA finalized new vehicle emissions requirements through 2026 that reversed then-President Donald Trump’s rollback of car pollution cuts.

Audrey LaForest of Automotive News contributed to this report.

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