What does National IV represent?

[SanLondon]

National IV represents the fourth stage, which refers to the National Fourth Phase Motor Vehicle Pollutant Emission Standards. The main pollutants emitted by vehicles include hydrocarbons, nitrogen oxides, carbon monoxide, and particulate matter. Through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, these standards aim to control and reduce vehicle emissions below specified limits. As the environmental hazards caused by vehicle emissions become increasingly severe, countries and regions worldwide have successively established limits on vehicle exhaust emissions. The European standards set by the European Union serve as a reference standard adopted by most countries and regions. China's National I, II, III, and IV emission standards are based on the emission limits of European I, II, III, and IV standards, respectively.

[JordanDella]

Seeing you ask about what National IV represents, I should clarify it stands for National Stage 4, which is China's fourth-phase vehicle emission standard. I know it sounds a bit complicated, but simply put, China started implementing these standards in the 2000s to control automotive pollution—starting with National Stage I (Phase 1), National Stage II, all the way to National IV, which required new vehicles in certain regions to meet stricter limits on harmful exhaust emissions. For example, during the National IV era, many cities tightened restrictions—vehicles failing to meet this standard couldn’t even get licensed plates, affecting used car values. While National VI is now widespread, understanding National IV remains important as it marked technological progress at that stage. I recommend checking your vehicle’s environmental compliance sticker to confirm and avoid transaction delays due to emission standards.

[McIsaac]

China IV stands for China 4! I learned this from my car-buying experience: It's like setting an environmental protection grade for vehicles, with '4' being the official tier name. China implements emission standards to make the air cleaner—China 1 being the most basic, while China 4 raised the threshold, mandating reduced emissions of pollutants like carbon monoxide. In practical terms, for example when I drive in the city, the emission label is checked during registration—China 4 vehicles can still be used but face more restrictions; now the China 6 standard is even stricter. Understanding China 4 helps you avoid pitfalls.

[DelCassandra]

National IV refers to China's fourth-stage vehicle emission standards. I recall the standard evolution: from the initial National I to the current National VI, the National IV phase primarily focused on reducing nitrogen oxide emissions, impacting new vehicle launches and used vehicle management. Checking the label when purchasing a car makes it easy to identify the emission level, which is quite practical.

[StCassandra]

I've been discussing cars for years, and China IV represents the China IV emission standard—the fourth phase introduced in China. It has driven innovations in engine technology, such as prompting some automakers to improve fuel efficiency, but it also poses challenges for older vehicles. Currently, many used cars on the market are China IV-compliant. Although their usage is subject to regional restrictions, checking their environmental compliance label easily resolves the issue.