An increasing number of states are requiring vehicle emissions testing many times called a smog check or smog test. This post describes what a smog check is in the state of California...

This post discusses how often a smog check is required in California. The quick answer is that it depends on where you live as California is divided into areas that determine test requirements....

The STAR program which is established by bill AB-2289 is the biggest change to the California smog check program in decades. It creates a new category of testing stations, STAR stations and simplifies the testing process for some vehicles...