What document must be retained after an emissions test is conducted?

After an emissions test is conducted, it is essential to retain the certificate of compliance or test results. This document serves as official proof that the vehicle has undergone the required emissions testing and indicates whether it passed or failed the test. It is crucial for vehicle owners as it may be required for vehicle registration, to demonstrate compliance with state emissions regulations, or to facilitate any future inspections.

The certificate provides detailed information about the test, including the date, results, and any emissions levels measured, which can be important if there is a need to address compliance issues or if questions arise regarding the vehicle's emissions status. Retaining this document helps ensure that the vehicle owner can easily provide validation of compliance with emissions standards when needed.