The U.S. Department of Justice announced on Friday that it is suing California over its emission standards for trucks, escalating the battle over the state’s authority to set its own clean air standards .

The DOJ filed two complaints in federal courts against the California Air Resources Board over a partnership the state inked with heavy-duty truck and engine manufacturers.

Through the Clean Truck Partnership , the Truck and Engine Manufacturers Association and other major truck manufacturers agreed in 2023 to meet the state’s vehicle standards that require the sale and adoption of zero-emissions technology. The manufacturers pledged to do so regardless of any legal challenges that might arise to the state’s authority to set more stringent emission standards.

In exchange, CARB agre

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