中国轻型车排放标准： 从借鉴到创新的绿色进阶之路

Group 1 - The article highlights China's commitment to environmental protection through the implementation of multiple stages of emission standards for light-duty vehicles since 2000, culminating in the planning of the seventh stage [2][8] - The first stage of emission standards, implemented in 2000, marked a significant shift from outdated carburetor systems to fuel injection technology, resulting in over 80% reductions in carbon monoxide, total hydrocarbons, and nitrogen oxides emissions compared to pre-standard levels [4][5] - The second stage, introduced in 2005, further tightened emission limits for hydrocarbons and nitrogen oxides, reducing them to about half of the first stage limits, while primarily optimizing existing technologies [5][7] Group 2 - The third stage, implemented in 2008, introduced significant changes in testing protocols, including immediate emission testing after engine start and the addition of low-temperature cold start requirements, enhancing the overall emission control strategy [6][11] - The sixth stage, established in 2016, marked a shift towards independent innovation, creating a comprehensive emission standard system tailored to China's environmental needs, including the introduction of Real Driving Emissions (RDE) testing [9][10] - The sixth stage also set stringent requirements for evaporative emissions and refueling processes, addressing volatile organic compounds (VOCs) as a major source of urban air pollution, and upgraded On-Board Diagnostics (OBD) systems to enhance monitoring capabilities [12][13] Group 3 - The upcoming seventh stage of emission standards aims to further tighten pollutant control and introduce CO₂ emission regulations, reflecting a comprehensive approach to managing both pollutants and greenhouse gases [14]