What is the National IV Standard?

[RafaelMarie]

National IV Standard is the fourth stage national standard for motor vehicle pollutant emissions. Here is a partial introduction to the National IV emission standard: 1. Introduction: The National IV emission standard is the fourth stage national standard for motor vehicle pollutant emissions. 2. Vehicle emission pollutants: Mainly include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), PM (particulate matter), etc. 3. Purpose: Through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, it aims to control and reduce vehicle emission pollutants below specified limits.

[LeRiley]

I remember when buying a car around 2010, the salesperson mentioned the China IV emission standards. Essentially, it's a new set of national regulations for vehicle exhaust emissions, requiring cars to emit fewer pollutants like carbon monoxide and hydrocarbons, keeping them within specified limits. Simply put, it's about making our air cleaner and reducing smog. If the used car you buy doesn't meet China IV standards, you might face driving restrictions in big cities like Beijing, Shanghai, or Guangzhou, which can be quite a hassle. During annual inspections, this is a key check item—failing means you'll need to get your car fixed. I recommend not skimping on fuel quality; using low-grade gasoline can damage the catalytic converter and affect emissions. In short, China IV standards are a threshold—when buying a car, check the label in the vehicle manual to ensure compliance. Don't think this isn't important; it affects your annual car insurance and maintenance costs.

[DelJordan]

I think the China IV emission standards are a major move by the country to promote environmental protection, requiring vehicles to emit fewer harmful gases during operation, strictly limiting pollutants like nitrogen oxides and particulate matter that damage air quality. This measure has been a great help, especially in cities, reducing air pollution so we don't have to wear masks all the time when going out. I remember that since 2008, new vehicles have gradually implemented China IV standards, which pushed automakers to upgrade technologies, such as using better exhaust treatment systems. We ordinary people can also contribute, like maintaining our cars regularly, keeping engines clean, and preventing black smoke from vehicles. Actually, after China IV, there are China V and China VI standards, showing that the path to environmental protection is endless. In short, supporting China IV is a good way to support blue skies and white clouds, and everyone should pay attention and comply with the rules.

[Grady]

In the automotive industry, the China IV emission standard marked a turning point. I recall it regulated the emissions of new vehicles at the factory, requiring them to meet stricter limits before being sold. This impacted the used car market—vehicles compliant with China IV or above retained their value better, while those below China III became harder to sell, especially in cities with strict environmental policies where license plates couldn’t even be issued for them. After implementing this standard, automakers invested in R&D to improve engine efficiency, and even gas stations had to upgrade fuel quality to China IV level to match vehicle requirements. In the long run, it accelerated the adoption of new technologies, giving electric or hybrid vehicles a competitive edge. Personally, I’ve learned that checking a car’s environmental rating is now essential—don’t just go for the cheapest option and regret it later.

[DeBrielle]

Recall that the China IV standard, officially known as the Fourth Stage Emission Standards for Motor Vehicles, was implemented as early as 2007 on a vehicle-type basis—first for heavy-duty vehicles and then light-duty vehicles. It represented an upgrade from the China III standard with stricter pollutant limits, introduced in response to China's deteriorating environment and severe air pollution at the time, necessitating urgent emission control measures. Its implementation also drove policy reforms, such as promoting OBD systems to monitor emissions (triggering warning lights if issues arose). Though adoption took time, the results were significant, and in retrospect, it marked a major step forward in environmental protection.