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 Connecticut (CT), residents are required to title and register their vehicles with the Connecticut Department of Motor Vehicles (DMV). New residents must transfer their out-of-state vehicle registration to Connecticut within 60 days of establishing residency. The state does not require a comprehensive safety inspection for vehicles. However, Connecticut does mandate emissions testing for most vehicles every two years. Emissions tests are required for vehicles that are four years old or older, with some exceptions such as electric cars, motorcycles, and vehicles over 25 years old. The emissions program aims to improve air quality and is enforced in all Connecticut counties. Failure to comply with emissions testing can result in the inability to renew a vehicle's registration.