What is the equivalent national emission standard for Euro 3?
1 Answers
Automotive Euro 3 corresponds to China's National III emission standard. The National III emission standard is introduced as follows: 1. The so-called National III standard refers to China's third-phase vehicle emission standard, which is equivalent to the Euro 3 emission standard in terms of tailpipe pollutant levels. The key difference is that new vehicles must be equipped with an OBD (On-Board Diagnostics) system. 2. The characteristic of the OBD system lies in the increased number of detection points and monitoring systems. Oxygen sensors are installed at both the inlet and outlet of the three-way catalytic converter, ensuring compliance through real-time emission monitoring, thereby better enforcing the Euro 3 emission standard. 3. When vehicle emissions fail to meet Euro III standards due to factors like fuel quality, implementing the National III standard will increase single-vehicle costs. To stably achieve the National III emission standard, vehicles must be equipped with technical measures that ensure pollutant emissions meet National III requirements, along with using fuel that complies with Euro 3 standards. 4. There is no significant difference between National III and Euro 3, as they are essentially equivalent with only minor adjustments in certain aspects. In China, segmented tailpipe emission measurements are adopted: at 25% load with a speed of 40 km/h (2540 load condition) and 50% load with a speed of 40 km/h (5040 load condition). In contrast, overseas measurements focus on the engine's instantaneous operating conditions under different working states.
