The Trump administration has continued to scale back vehicle emissions-related regulations that were expanded under the ...

A drive cycle is a standardized test procedure to measure a vehicle's emissions and fuel economy. The test is designed to mimic typical driving patterns, such as city and highway driving, and to ...

The Justice Department ordered prosecutors to drop all pending cases targeting the sale of illicit "defeat devices" in diesel-powered vehicles.

Starting in 2026, diesel owners and repair shops will no longer run the risk of federal criminal chargers for performing two ...

A new policy has halted all criminal investigations and prosecutions of those who bypass vehicles’ emissions control systems, although civil enforcement may continue. The Justice Department on ...

Long the focus of regulators in their efforts to clean up the air, the automobile has become so clean there are now cases where the air coming out of the tailpipe is cleaner than the surrounding air.