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 ...

The emission measurement procedure using the “free acceleration” method has caused many diesel vehicle owners to worry about engine impact.

Add Yahoo as a preferred source to see more of our stories on Google. If you're due to get your vehicle tested for pollutant emissions, the process is now a bit easier in the Milwaukee area: the state ...

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 ...