In a significant policy reversal, California has withdrawn its requests for tighter clean air regulations, including the phase-out of diesel trucks and locomotives, as the state braces for a new political landscape with the impending Trump administration. The state has abandoned its Advanced Clean Fleets waiver request and pulled back its proposals for electric vehicle mandates, marking a major shift in its environmental strategy. This retreat from stringent pollution rules is celebrated by some industry groups, while raising concerns over the future of clean air initiatives that could now be at risk under the forthcoming administration.