The purpose of this study is to conduct a trial estimation of CO₂ emissions of passenger cars by municipality using individualstatistics of automobile inspection certificates, and to propose a simplified method that takes into account light passenger cars, whichare not included in the same statistics. The simplified method is a method that uses linear function equations for mileage per vehiclefor passenger cars and light passenger cars, which are derived from automobile fuel consumption statistics. Through this study, webelieve that it is possible to obtain estimates with higher spatial and temporal resolution than the method for estimating passengercar CO₂ emissions by region using data from The Road Traffic Census OD survey. In the future, we intend to compare this methodwith the estimation using The Road Traffic Census and also to study the estimation method using information on vehicleinspections of light vehicle.