Welcome to the Connecticut Emissions Program

The State of Connecticut requires emissions testing every two years on all vehicles except:

  • 2018, 2019, 2020, 2021 model year vehicles;
  • Model year 1996 and older vehicles;
  • Vehicles with a gross vehicle weight rating of 10,001 pounds or more;
  • Composite Vehicles (vehicle must be titled as a composite vehicle);
  • Full electric-powered (non-hybrid);
  • Bicycles with motors attached;
  • Motorcycles;
  • Certain vehicles registered but not designed primarily for highway use;
  • Farm vehicles;
  • Diesel – Powered Type II School Buses” (under 10,000 lbs GVWR)
  • Vehicles with Dealer, Repairer, or Transporter Plates (only for the purpose of transportation during wholesale or auction).