Exhaust gas

Exhaust gas is what comes out of cars and other vehicles that use fuel to run. Inside the engine, fuel is burned and this process releases exhaust gas. The exhaust gas is made of a mix of chemicals, water vapor, and tiny particles of matter. The exhaust gas then travels up the pipe on the back of the vehicle and out of the exhaust tip at the end. The exhaust gas can be unhealthy for people because it contains some harmful chemicals, and some of these chemicals can cause health problems or make the air in our environment dirty.