Your engine produces harmful gases and pollutants. But you probably already knew that. What you might not know is that your car has an exhaust system in place to transform harmful pollutants into less harmful exhaust fumes.
Here’s how it works. As your engine produces pollutants—such as hydrocarbons, carbon monoxide and nitrogen oxides—and the fumes are collected in the manifold, which is basically a funnel designed to capture harmful gases and funnel them through the exhaust system.
Then the gases travel to the catalytic converter, which chemically changes harmful pollutants into less harmful gases. Nitrogen oxide becomes nitrogen gas. Hydrocarbons and carbon monoxide become water vapor and carbon dioxide. These gases—which are proven to contribute less to smog and ozone depletion—are then routed away from your car via the tailpipe.
So that’s how your exhaust system works to reduce pollution. Pretty cool, right? Well, the smog and emissions test is just a quick check to make sure all the components of your exhaust system are working as intended.
In Missouri, technicians test your vehicle’s emission control system by attaching the state-mandated testing equipment to your car’s computer. This equipment will test the sensors to make sure everything is working as designed by the vehicle’s manufacturer. For more information on car diagnostic testing and equipment, click here.