Which vehicles are required to undergo enhanced emissions testing in Pennsylvania?

In Pennsylvania, enhanced emissions testing is specifically aimed at reducing air pollution and assessing the emissions performance of gasoline-powered vehicles. The requirement for gasoline vehicles model year 1975 and newer aligns with the state's efforts to monitor and control emissions from older vehicles that may not meet modern standards. This population of vehicles is a significant source of pollutants, making it crucial to include them in emissions testing programs.

The other categories, such as motorcycles, hybrids, and diesel-powered vehicles, have different regulations or may not fall under the same enhanced testing requirements as gasoline-powered vehicles from the specified model years. Motorcycles, for example, have separate emission standards and testing metrics, while hybrids generally already meet stricter emissions criteria due to their design and function. Diesel vehicles have their own requirements based on factors such as engine type and emission technology, also differing from the broad category of gasoline-powered vehicles.