Ceasefire in the diesel emission war is not peace
Eleven pardons, a dead prosecution policy, and a mandate that still stands.
On July 9, 2026, EPA signed a proposed rule that would stop new diesel engines from cutting a truck’s speed when the emissions system throws a fault. Instead of a derate, the driver gets a beep and a light. Sixteen years after the agency required manufacturers to build a strategy that slows a loaded truck to 5 mph on an interstate shoulder, EPA now says that strategy caused needless frustration, operational delays, and real economic hardship. Those are the agency’s words, on the agency’s website.
Six days before that proposal, the President pardoned nine men who went to federal court for defeating the exact system the agency now admits is broken.
The pardons were not the story.
Nothing that happened in January, in June, or on July 3 repealed one word of the Clean Air Act. Civil penalties of $45,268 per tampered engine and $4,527 per defeat device sold remain fully on the books. Every consent decree still binds. Every Section 306 disqualification still stands. This is decriminalization, not legalization, and the next administration can restart it with a one-page memo.
Every number above is the government’s own.
Tactical military vehicles can be exempted from EPA emission standards under the national security exemption at 40 CFR 1068.225. The commercial tractor hauling that vehicle to the seaport cannot, and it will derate for a broken wire.
EPA freed ambulances and fire apparatus from the derate because a fire truck losing power at a structure fire was intolerable. It has never explained why the same reasoning stops at the ambulance bay door.
Every diesel rule since 2007 was justified by monetized reductions in fine particulate and ozone. In January 2026 EPA published its own position that counting those co-benefits was inappropriate. The costs did not move.
The statute is untouched.
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