What is the exhaust emission standard?
2 Answers
In 2001, China introduced the China Phase I emission standard with reference to European emission standards, followed by National II, National III, National IV, and National V. Currently, the domestic automobile exhaust emission standard in China is the National V standard. The National V emission standard was officially implemented on January 1, 2017, and the National VI standard will also be implemented in 2020. More details about the exhaust emission standards are as follows: 1. Introduction 1: The National IV automobile exhaust emission standard refers to the national fourth-stage motor vehicle pollutant emission standard. The main pollutants emitted by automobiles include hydrocarbons, nitrogen oxides, carbon monoxide, and particulates. Through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, the emission of automobile pollutants is controlled and reduced to below specified values. 2. Introduction 2: The National V automobile exhaust emission standard is equivalent to the Euro V standard in the European Union, which has been implemented since 2009. It imposes stricter limits on motor vehicle emissions such as hydrocarbons, nitrogen oxides, carbon monoxide, and suspended particles. From National I to National V, each upgrade in the standard reduces single-vehicle pollutants by 30% to 50%. 3. Introduction 3: Compared to the National V emission standard, the National VI emission standard is more stringent in terms of testing standards and pollutant emissions. The test cycle has been changed from NEDC to WLTC standards, with the addition of real-world driving emission tests. The pollutant limits are stricter, with National VI being approximately 40% to 50% more stringent than National V. The CO and HC limits are about one-third stricter compared to National V.
I've always been fascinated by automotive technology. Emission standards are regulations set by governments to limit the amount of harmful gases vehicles can release, primarily aimed at reducing air pollution and protecting public health. For instance, they control pollutants like carbon monoxide, nitrogen oxides, and particulate matter—these culprits result from incomplete engine combustion and can easily cause smog or respiratory diseases. Automakers must comply by employing technologies such as catalytic converters or improved engine designs. Standards vary by region: China has its China 6 classification, while the EU follows Euro standards. Vehicles failing to meet these standards can't be driven legally and must be repaired if they fail annual inspections. These regulations also influence new car development, driving innovations like hybrid systems. Higher standards lead to improved air quality, reduced healthcare costs, and promote the transition to green industries, playing a crucial role in sustainable development.
