When did China's National III vehicle emission standard come into effect?

[MacDelilah]

China's National III vehicle emission standard came into effect on July 1, 2008. According to national regulations, from July 1, 2008, the National III testing standard for vehicle exhaust emissions was mandatorily implemented nationwide. The upgrade of emission standards is beneficial for environmental protection. The National III standard is China's third-stage vehicle emission standard. The National III emission standard is equivalent to the Euro 3 emission standard, meaning the content of exhaust pollutants is equivalent to Euro 3 levels. The difference is that new vehicles must be equipped with an OBD (On-Board Diagnostics) system. Characteristics of the OBD system include: increased detection points, more detection systems, with oxygen sensors installed at both the inlet and outlet of the three-way catalytic converter. It fully controls compliance through real-time monitoring of vehicle emissions, thereby better ensuring the implementation of the Euro 3 emission standard.