What does a “smog check” evaluate?

A "smog check" primarily evaluates a vehicle's emissions output to ensure it meets the environmental standards set by local laws. This assessment is crucial for controlling air pollution and ensuring that vehicles are not releasing excessive amounts of harmful gases and pollutants into the atmosphere. During the check, various tests are performed to measure the levels of emissions, including hydrocarbons, carbon monoxide, and nitrogen oxides. Meeting these emissions standards is essential for maintaining air quality and public health.

While safety features, fuel efficiency, and the overall condition of the vehicle are important aspects of vehicle maintenance and operation, they are not the focus of a smog check. The primary goal of this evaluation is to make sure that the vehicle is compliant with emissions regulations, thus reducing the environmental impact of automotive use.