What is the maximum age a vehicle can be exempt from emissions testing?

A vehicle is exempt from emissions testing if it is less than 8 model years old. This exemption is in place to recognize that newer vehicles typically emit lower levels of pollutants due to advancements in technology and stricter manufacturing standards. Once a vehicle reaches 8 model years, it is subject to emissions testing to ensure ongoing compliance with environmental regulations. This policy is designed to balance the need for emissions control with the acknowledgment that newer vehicles are generally cleaner and thus less of a burden on air quality.

The other options suggest either shorter or longer periods of exemption, which do not align with the current regulations that govern emissions testing in Pennsylvania.