The Pennsylvania Motor Truck Association (PMTA) is applauding a major victory in Washington after President Trump signed two Congressional Review Act (CRA) resolutions on June 12 that formally repeal key emissions regulations advanced by the California Air Resources Board (CARB) and approved by the Environmental Protection Agency (EPA).

The President’s action follows a 49–46 Senate vote and prior action by the U.S. House to overturn EPA’s waivers allowing California and other states to enforce emissions rules far stricter than federal standards. One resolution blocks the EPA’s waiver for CARB’s Low NOx Omnibus rule, which would have required a 90% reduction in NOx emissions for model year 2027 trucks. PMTA has long argued that the rule’s mandates sharply increase the cost of new diesel trucks and disrupt fleet operations across Pennsylvania.

The second resolution repeals EPA’s waiver for California’s Advanced Clean Trucks (ACT) regulation, a rule adopted in 11 states that sought to phase in mandatory sales quotas for electric and zero-emission trucks between 2024 and 2035.

Although Pennsylvania did not adopt ACT, it is among the states that follow CARB’s Low NOx Omnibus rule through a rolling adoption process—one that PMTA and its members challenged in Commonwealth Court. PMTA’s lawsuit contends that Pennsylvania cannot cede its regulatory authority to another state, particularly when it imposes significant costs and compliance burdens on Pennsylvania trucking businesses.

On May 10, 2025, the Pennsylvania Department of Environmental Protection (DEP) announced it would extend its suspension of enforcement of the Low NOx rule through January 2, 2028, citing ongoing litigation and growing federal opposition to California’s regulatory reach—now confirmed by the President’s signature.

“This action confirms what PMTA has consistently argued: these mandates pose serious legal concerns, impose excessive costs, and ignore how the trucking industry truly operates,” said Rebecca Oyler, President and CEO of PMTA. “We applaud Congress and the President for stepping in to prevent California from dictating nationwide emissions policy.”

PMTA will continue working to ensure that Pennsylvania maintains control over its own emissions policies.