In recent days, the implementation of the National Technical Standard on emissions for automobiles, especially those using ...

For millions of Americans, regular emissions tests — sometimes called smog tests — are part of vehicle ownership. Thirty-one states and the District of Columbia have at least one county that requires ...

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 ...

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 ...

EVERETT — The dread of driving a clunker to an emissions test — and maybe facing an expensive fix — is over. After 38 years, Tuesday is the final day vehicles must be analyzed for carbon monoxide ...