Across the United States, the rules for checking tailpipe pollution are quietly shifting, even as climate targets grow more ambitious and electric vehicles grab headlines. States are carving out ...

Although there has been increased attention paid to electric vehicles in recent years, that doesn't mean the regulations for gas guzzlers have been relaxed. Both automobiles and motorcycles still need ...

The contractor that oversees Wisconsin’s vehicle emission testing program is making changes to address a slide in the number of car repair facilities willing to conduct the tests for them. In 2012, ...