What are the symbols for China's Emission Standards from National I to National VI?

[VonSadie]

From National I to National VI, the symbols are I, II, III, IV, V, and VI respectively. Additional information is as follows: Reasons for establishing emission standards: Automobiles are mobile sources of pollution, emitting primary pollutants such as carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter (PM), all of which are substances that pollute the environment and need to be controlled. The sources of automobile pollutant emissions come from the exhaust pipe, crankcase, and fuel system. Establishment of regulations: With the increasing severity of automobile exhaust pollution, legislation on automobile exhaust emissions has become imperative. Countries around the world established corresponding regulatory systems for automobile exhaust emissions as early as the 1960s and 1970s. Strict regulations have driven the advancement of automobile emission control technologies, and with the continuous improvement of these technologies, the formulation of higher standards has become possible.

[MacKhloe]

I've been driving for over a decade, and the emission standards from China 1 to China 6 use Roman numerals as symbols, such as I, II, III, IV, V, VI. Specifically, China 1 refers to Standard 1, which was implemented starting in 1999, and the symbol is often written as 'China I' on vehicle environmental labels or manuals. From China 2 to China 6, the symbols represent progressively higher standards, with China 6 currently being the highest, denoted by VI, indicating stricter control over exhaust pollution. When buying a car, it's important to pay attention to these symbols—vehicles below China 3 are restricted in some major cities, unable to be registered or enter urban areas, which affects travel convenience. Upgrading standards helps reduce harmful gas emissions and protect air quality. When choosing a car, I prioritize China 5 or China 6 models, as they save money and are environmentally friendly. During routine inspections at the vehicle management office, this symbol is also checked to ensure compliance with local policies.

[LucilleDella]

As someone interested in automotive history, the emission standard symbols from China I to China VI are represented by Roman numerals I to VI, reflecting the evolution of China's environmental regulations. Starting with the introduction of the China I symbol in 1999, the China VI symbol VI became mainstream by 2020, with each upgrade strengthening emission limits. The symbols represent the stringency of testing standards, for example, China IV imposes stricter limits on nitrogen oxides, while China VI is more comprehensive. This helps drive advancements in automotive technology and reduces urban smog issues. From my research, the changes in symbols reflect society's growing environmental awareness, encourage automakers to innovate, and also impact the used car market, where vehicles meeting China IV and above standards tend to be more valuable. In the long run, the symbol upgrades contribute to greener transportation.