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 ...

SMOG checks or emission tests exist due to the U.S. Environmental Protection Agency's (EPA) regulation on passenger vehicles. Each state sets limits of nitrogen oxides (NOx) from emitting past certain ...

Ending greenhouse gas emissions standards for new cars is supposed to result in more affordable choices for consumers and regulatory relief for companies, according to a statement from the ...