California air quality enforcers approve rule limiting emissions from idling trucks

California clean air regulators have approved a new rule aimed at dramatically limiting emissions from slow-moving and idling trucks, arousing the ire of trucking groups and potentially setting up another conflict with the Trump Administration over the state’s authority to enact air quality regulations.

Members of the California Air Resources Board (CARB) on Friday unanimously voted to adopt the “Heavy-Duty Omnibus ( HD Omnibus)” rule. The phased-in regulation would require current NOx (nitrogen oxides) standards be cut about 75% below current standards beginning in 2024 and 90% below current standards in 2027.

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