The Environmental Protection Agency has proposed conditionally approving New Hampshire's request to remove its motor-vehicle emissions inspection program as an active measure in the state's federally enforceable air plan.
The proposal would retain the inspection-and-maintenance program as a possible contingency measure rather than erase it from the plan entirely. It does not by itself repeal a current state inspection requirement.
EPA says final approval would depend on the agency separately granting New Hampshire's request to leave the Ozone Transport Region. Without that separate action, the condition described in Tuesday's proposal would not be satisfied.
New Hampshire would also have to submit another state implementation plan revision within one year of a final conditional approval. If it misses that commitment, the conditional approval would automatically convert to a disapproval under the Clean Air Act process described by EPA.
State modeling compares a 2022 baseline with the inspection program to projected 2026 conditions without it. The model shows nitrogen-oxide emissions down 16.0%, volatile organic compounds down 2.7% and carbon monoxide down 1.9%, even as vehicle miles traveled rise.
Those percentages are projections, not measurements of what happened after a repeal. EPA and the state attribute much of the modeled decline to turnover toward newer vehicles with lower emissions.
The federal air-plan question is also separate from New Hampshire's safety-inspection rules and any state implementation timetable. Drivers should not treat the proposal as a change to current compliance obligations.
EPA is asking for comments through Sept. 25, 2026. The agency may alter the conditions, decline approval or take a different action after reviewing the record.
If finalized as proposed, the change would give New Hampshire a path to rely on fleet turnover and other plan measures while keeping emissions inspection available as a contingency. The state and federal steps still have to occur in the specified order.