What is considered a 'High Emission Vehicle' in California?

A 'High Emission Vehicle' in California is defined as a vehicle that exceeds established emissions thresholds based on its model year and test results. This classification is critical as it helps identify vehicles that produce emissions above the acceptable levels set by regulatory standards.

By focusing on the model year and test results, California can target vehicles that contribute significantly to air pollution, allowing for more effective management and compliance with air quality regulations. This categorization helps in promoting cleaner air by prioritizing the inspection and potential remediation of those vehicles that are most likely to harm the environment due to their higher emissions.

While other choices mention specific vehicle categories or types, they do not encapsulate the criteria based on performance data and regulatory thresholds in the same way that the correct option does.