Emissions testing laws are a crucial component in the fight against air pollution and climate change, yet these regulations vary significantly across the United States. Understanding these differences ...

Certain vehicles now face tougher emissions checks under updated federal rules, and that could affect which cars get extra testing at the dealership or inspection station. If you own or sell a light- ...

COLUMBUS, Ohio—The U.S. Environmental Protection Agency has rejected Ohio lawmakers’ attempt to allow Cleveland-area vehicle owners to avoid E-Check emissions testing simply by signing a form ...

The California Air Resources Board (CARB) has certified only one telematics provider to participate in its Clean Truck Check (CTC) program with just over a quarter of the year left before heavy- and ...