2026 Nitrogen Oxides Technology 
Union of Concerned Scientists
DECEMBER 21, 2023
But while greenhouse gas emissions may be reduced, a delivery fulfilled by a diesel-burning truck may lead to increases in emissions of smog-forming nitrogen oxides and lung-damaging particulate matter.
Union of Concerned Scientists
MARCH 26, 2024
By 2032, new light-duty vehicle climate emissions would decrease by nearly 50 percent (to 85 grams/mile) compared to existing standards that go through 2026. This is a common sense step that relies on affordable, proven technology already in use in millions of gasoline vehicles outside the US. One thing to keep in mind. Far from it.
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Union of Concerned Scientists
DECEMBER 15, 2022
The EPA is getting ready to finalize a critical regulation limiting emissions of smog-forming nitrogen oxide (NO X ) and soot (or particulate matter, PM 2.5 ) from new heavy-duty trucks. Indefinite delay of more effective emissions technology could permanently impede the path towards cleaning up the diesel truck fleet.
Union of Concerned Scientists
MARCH 12, 2024
In 1963, a typical car—which ran on leaded gasoline without pollution control devices— emitted 520 pounds of hydrocarbons, 1,700 pounds of carbon monoxide, and 90 pounds of nitrogen oxide every 10,000 miles traveled. Even so, cars and trucks are still making us sick—and killing us.
Union of Concerned Scientists
NOVEMBER 28, 2023
EPA considering a range of alternatives EPA proposed standards that would aim to reduce greenhouse gas tailpipe emissions by about 70 percent compared to today’s vehicles (or about a 60 percent reduction from the 2026 standards currently on the books), to a lab certification level of emissions of 82 grams per mile (g/mi) by 2032.
Union of Concerned Scientists
APRIL 13, 2023
While EPA has projected gasoline vehicles to improve by close to 20 percent between now and 2032 in order to meet its standards, largely the result of standards already on the books through 2026, this could and must be closer to 30-35 percent to be consistent with our urgent need to address climate change.
Legal Planet
OCTOBER 5, 2023
The transportation sector is also a substantial source of nitrogen oxides and particulates, both of which are dangerous to human health. EPA has considered electrification technologies in many past rulemakings and has used fleet average standards for decades. Transportation is now the source of 28% of U.S.
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