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Engine Testing RegulationsVehicle and Fuel Emissions TestingUS

Engine Testing RegulationsVehicle and Fuel Emissions TestingUS 2025

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The document outlines the Heavy-Duty Vehicle Greenhouse Gas Reduction Measure aimed at reducing greenhouse gas emissions from heavy-duty tractors and box-type trailers operating on California highways. It details the purpose, applicability, definitions, compliance requirements, and deadlines for various stakeholders including owners, drivers, motor carriers, brokers, shippers, and receivers. The regulation mandates the use of U.S. EPA Certified SmartWay technologies for vehicles and trailers to enhance fuel efficiency and reduce emissions. It also includes provisions for exemptions, reporting requirements, enforcement mechanisms, penalties for non-compliance, and severability clauses.

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How are vehicle emissions regulated in the US?

The EPA issued a new rule in December 2021, to become enforceable by February 2022, that effectively restored the Obama-era standards, through decreasing the fleet-wide emissions target to a projected 161 g CO2/mi by the 2026 model year.

What is an engine emission test?

Emissions testing serves as a regulatory mechanism to ensure vehicles on the road meet certain environmental standards. Depending on where you live, these tests may be mandatory at regular intervals or conducted during vehicle registration.

Does the EPA regulate car emissions?

EPA regulates motor vehicle emissions through performance-based standards that impose fleet-wide average emissions limitsindividual vehicles with higher emissions are allowable if the fleet average achieves EPAs emissions targets.

Who regulates emissions in the US?

EPA finalizes Most Stringent Vehicle Emission Standards EPA has finalized standards for passenger cars, light-duty trucks, medium-duty vehicles, and heavy-duty vehicles for model years 2027 through 2032 and beyond.

What standards regulate vehicle fuel efficiency in the US?

NHTSAs Corporate Average Fuel Economy (CAFE) standards regulate how far our vehicles must travel on a gallon of fuel. NHTSA sets CAFE standards for passenger cars and for light trucks (collectively, light-duty vehicles), and separately sets fuel consumption standards for medium- and heavy-duty trucks and engines.

How are emissions regulated?

All of EPAs emission regulations specify test procedures to measure engine or vehicle emission levels. EPA uses the test results to determine compliance with the applicable emission standards. The number and types of tests vary ing to the regulated sector.

How many states in the US require emissions testing?

Which states require vehicle emissions testing? There are 34 states that require emissions testing for cars, and exact rules vary widely by state. Some states only require testing in certain areas of the state, including certain counties and metropolitan areas.

Engine Testing RegulationsVehicle and Fuel Emissions TestingUS 2025

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