Emission testing is a process used to measure the amount of pollutants released by a vehicle's engine. This testing helps ensure that cars and trucks meet environmental standards set by government regulations. By checking emissions, authorities can identify vehicles that may be contributing to air pollution and require necessary repairs or upgrades. During an emission test, a vehicle is typically connected to specialized equipment that analyzes exhaust gases. The results indicate whether the vehicle is operating within acceptable limits for harmful substances like carbon monoxide, nitrogen oxides, and particulate matter. Regular testing helps promote cleaner air and a healthier environment.