According to an embodiment, a system for calculating air pollutant emission comprises a sensor device installed in an regional section and obtaining a captured image of a vehicle passing through the regional section, an external server storing vehicle specification information, and a management server identifying the vehicle based on the captured image provided from the sensor device, obtaining the vehicle specification information for the identified vehicle from the external server, calculating air pollutant emission for each emission source using the vehicle specification information, and providing statistical information for the air pollutant emission.