How are 'gross polluters' defined in Pennsylvania emissions testing?

In Pennsylvania emissions testing, 'gross polluters' are defined as vehicles that exceed specific pollutant thresholds. This classification is critical because it identifies vehicles that contribute disproportionately to air pollution and are therefore subjected to more stringent testing and repair requirements. By setting pollutant standards, the state can effectively target vehicles that may harm air quality significantly, ensuring compliance with emissions regulations aimed at protecting public health and the environment.

The definition encompasses not just any failure or issue with a vehicle but specifically those that indicate a significant increase in harmful emissions. This approach helps prioritize resources and efforts on vehicles that pose the greatest risk, promoting cleaner air standards statewide. Understanding this definition is essential for identifying vehicles that need immediate attention and correction during emissions testing.