Abstract :
Motorized vehicles are one of the main contributors to air pollution in big cities, including in Indonesia, where gasoline-powered vehicles pollute the air more than the industrial and household sectors. Exhaust gas from burning fuel contains dangerous toxins such as carbon monoxide (CO). The working system of this circuit is when the circuit is activated, Arduino initializes the circuit. When the circuit is ready to use, the sensor can detect motor vehicle exhaust gas. When the sensor has read the exhaust gas, the amount of exhaust gas read is calculated. If it exceeds the threshold as set, the red LED light will turn on and the buzzer will be active. The LCD will read the actual amount of gas counted at that time. If the amount of gas calculated does not exceed the threshold, only the green light will turn on and indicate that the vehicle is eligible for the emissions test. The test results from 9 tests that have been carried out on the device showed that 1 vehicle did not pass the emissions test. Possible factors causing this emission test to fail are the health condition of the motorbike engine, fuel use and the quality level of the motorbike oil. Based on these 9 tests, the level of conformity between the working system was 100%, this indicates that this device is functioning as it should and is expected.