Federal and California emissions rules decide what a new truck costs, what breaks on the road and what a shutdown in a parking lot costs a driver. Here is who in Congress voted to end them, who voted to keep them, and what taxpayers have paid in grants to replace diesel engines.
The history of the mandates, the people prosecuted under them, what they cost to own and fix, and the DEF Act tracker.
Federal grants to replace or retrofit diesel trucks, buses, port equipment and engines, by federal fiscal year.
The agencies, school districts, ports and companies that received the grants, award by award. Where an award says how many vehicles it replaces, the page divides the award by that number. Awards also pay for chargers, fueling equipment and training, so this is the full cost per vehicle, not the sticker price.
California set its own truck rules under federal waivers. In 2025 Congress voted to cancel two of them; both are now law. That summer H.R. 1 ended the federal tax credit for electric trucks and took back unspent clean-truck grant money, along with far more that had nothing to do with trucks. In 2026 the House voted to keep paying for diesel-replacement grants anyway.
Money to the members who cast these votes, 2020 to 2026, from three camps: national environmental groups (League of Conservation Voters, Sierra Club, NRDC, EDF, Environment America, Clean Water Action, Climate Hawks Vote, Climate Power), trucking-industry PACs, and oil and refining PACs (ExxonMobil, Chevron, Shell, BP, ConocoPhillips, Occidental, Valero, Marathon, Phillips 66, HF Sinclair, the refiners' and petroleum trade groups, and producers). Two kinds of money: what a group gave the campaign directly, and what it spent on its own to help or hurt the member.
Every bill this Congress aimed squarely at truck emissions rules, and the members who put their names on them. Each one links to its full record.
Each member's votes on the waivers and the grants, the emissions bills they sponsored or cosponsored, and the money: environmental groups and trucking PACs, given to the campaign or spent for and against them.
"End it" means a yes vote on a resolution cancelling California's waiver. A blank means the member wasn't in that chamber for the vote. Bills count sponsorships and cosponsorships from the list above. Money columns are FEC committee-to-candidate records, 2020 to 2026: "to campaign" is direct contributions, "for" and "against" are independent spending. "All trucking PAC money" is the site-wide figure, which also counts gifts to the member's leadership PAC and joint fundraising committees.