How many times should the emissions check be performed according to best practices?

Performing the emissions check twice is considered best practice for ensuring accurate and reliable results. The rationale behind conducting the emissions check on two separate occasions allows for the verification of the initial readings and helps to identify any inconsistencies or potential errors. This approach promotes thoroughness and increases the likelihood that the vehicle meets emissions standards.

Additional checks can help confirm that the vehicle operates typically under varying conditions, which may provide different readings. A single test may not capture transient issues or errors that could skew the results. By following the practice of performing the emissions check twice, inspectors can enhance confidence in the assessment and support regulatory compliance effectively. This practice aligns with the broader goal of maintaining environmental standards and promoting cleaner air quality.