What speeds are involved in the emissions testing procedure?

The emissions testing procedure involves both high and low speeds to accurately assess a vehicle's emissions under various operating conditions. Testing at low speeds allows inspectors to evaluate how the vehicle performs during typical stop-and-go driving conditions, which is crucial for understanding real-world emissions. Conversely, high-speed testing simulates highway driving, enabling the collection of data on how the vehicle operates at faster velocities.

This comprehensive approach ensures that emissions levels are measured across a spectrum of driving scenarios, reflecting the actual emissions produced during typical vehicle operation. By incorporating both high and low speeds, the testing process provides a more complete picture of a vehicle’s emissions characteristics, helping to ensure compliance with environmental regulations.