In the world, there are many problems regarding to the pollution. One of the major problems is air pollution. The air pollution has been increase because of more uses of the vehicle. Through the vehicle CO (Carbon Monoxide), HC (Hydrocarbon) are emitted which leads to global warming and it also affects animals and human health. If the vehicle is not maintain properly then the amount of smoke will get increase, which leads to increase in pollution. For this problem the solution is, we have developed a system i.e. Vehicle Emission Monitoring System that monitors the pollution exhausted from the vehicle. This system is based on IoT (Internet of Things). This system will be placed in the vehicle and starts monitoring when the vehicle’s engine get starts. The threshold value will be set according to the threshold value of PUC (Pollution Under Control) Center. When the exhaust value crosses about the threshold value alert message is send to the owner of the vehicle. The system consists of Arduino Mega 2560, CO sensors, HC sensors, air quality, GSM.