Most states have titling and registration laws that require residents to title and register their cars in the state—and for new residents of the state to do so within some period of time, such as 30 days. Some states require titled cars to pass a comprehensive safety inspection. And some states also require cars owned by residents of certain counties to pass an emissions test/inspection designed to improve air quality in more densely populated counties.
In South Carolina, residents are required to title and register their vehicles with the South Carolina Department of Motor Vehicles (SCDMV). New residents must title and register their vehicles within 45 days of establishing residency. The state does not require a comprehensive safety inspection for vehicles. However, residents in certain areas may be subject to emissions testing. Specifically, residents of Berkeley, Charleston, Dorchester, Greenville, Lexington, Richland, and York counties must have their vehicles pass an emissions test as part of the registration process. This requirement is part of the state's efforts to improve air quality in more densely populated areas. The emissions test, known as the 'IM' (Inspection/Maintenance) test, must be performed every two years for most vehicles.