Welcome to the Connecticut Emissions Program

The catalytic converter is a post-combustion control device that converts toxic exhaust emissions from your vehicle’s engine into less-toxic pollutants.

All vehicles are subject to visual verification of the catalytic converter(s), which must be present and properly installed.

Please be advised that the Clean Air Act prohibits tampering with emission control systems originally installed and certified by vehicle manufacturers. If your vehicle is missing a catalytic converter, it will fail the emissions test.