What is the National Standard IV for Vehicle Emissions?

[VanRemington]

Automotive National Standard IV refers to China IV emission standards, fully known as the National Fourth Stage Motor Vehicle Pollutant Emission Standards. The main pollutants from vehicle emissions include hydrocarbons, nitrogen oxides, carbon monoxide, and particulate matter. These pollutants are filtered through the active layer of catalytic converters, secondary air injection, and exhaust gas recirculation systems equipped with cooling devices to control and reduce vehicle emissions below specified limits. Implementing vehicle exhaust emission standards can effectively control the release of pollutants, reduce air pollution, protect the natural environment, and minimize health hazards.

[VanPenelope]

I've been driving for decades. China National Standard IV, commonly known as China 4 emission standard, refers to the fourth-phase national regulation on vehicle pollutant emissions. About over ten years ago, around 2008, many cities began mandatory implementation to reduce vehicle exhaust pollution, targeting harmful substances like carbon monoxide and hydrocarbons. I remember back then, buying a car required special attention—China 4 vehicles were cleaner than the previous China 3 models, performed similarly, but offered more freedom to enter urban areas. Looking back now, emission standards have progressed from China 1 and China 2 all the way to China 6, with China 4 becoming a transitional phase. Some regions have already started restricting license plate issuance or imposing driving limits on China 4 vehicles. The rapid upgrade of vehicle emission standards serves dual purposes: improving air quality for environmental protection and driving advancements in automotive technology, though it does make replacing parts during maintenance a bit more troublesome. In short, understanding these standards helps us avoid risks when choosing a car—for example, when buying a used car, don’t just look at the price; check its emission standard level too.

[DiLane]

As a young car enthusiast, the China National Standard IV is essentially the China IV emission standard, which represents the fourth phase of motor vehicle emission limits in China. It is significantly stricter than the China III standard, reducing nitrogen oxide and particulate matter emissions. For example, diesel vehicles must be equipped with particulate filters in their exhaust pipes to meet the requirements. I remember this standard was introduced around 2008, with many major cities implementing it first, and the requirements were even stricter during the Beijing Olympics. When it comes to modifications, China IV engines require more precise parameter adjustments, or they won’t pass inspections. Nowadays, China V and China VI standards are mainstream, and the resale value of China IV vehicles has plummeted. Some restricted zones don’t even allow them into the city, so it’s better to spend a bit more on a newer model. These standards are implemented to reduce pollution, and while urban smog has decreased, car owners also have to spend more on vehicle upgrades or maintenance. Overall, though, they’ve driven the development of new energy vehicles, which is a progressive trend.

[LaTucker]

With years of experience in auto repair, China National Standard IV refers to the National IV Emission Standard, which is the fourth-tier national emission control. It imposes stricter limits on pollutants for both gasoline and diesel vehicles, such as reducing nitrogen oxide emissions by approximately 20% and implementing more rigorous emission monitoring. Common maintenance issues include oxygen sensor failures or clogged after-treatment systems, requiring regular upkeep by vehicle owners. Implemented between 2005 and 2013, this standard influenced vehicle design and usage, and is now gradually being replaced by the National V standard.

[LaJudah]

I support environmental protection. China National Standard IV (China 4) is the fourth-stage emission standard, which imposes limits on harmful substances in vehicle exhaust such as carbon dioxide and particulate matter. Implemented around 2008, it prompted automakers to adopt cleaner technologies, such as upgraded catalytic converters, reducing urban air pollution indices. However, compared to the current China 6 standard, China 4 still has relatively higher emissions. During the transition period, some cities imposed restrictions or bans on such vehicles. I believe these standards are crucial for protecting the environment, reducing our exposure to exhaust fumes, and everyone should prioritize choosing vehicles with higher emission standards.

[Brody]

As an average car owner, China National Standard IV refers to the National IV emission standard, simply put, the fourth level. When I bought my car in 2010, I opted for the National IV standard because older cars below National III couldn't enter urban areas. In terms of driving, there wasn't much change in fuel consumption or power, but it's more environmentally friendly, though maintenance parts are a bit more expensive. Nowadays, National V and National VI are becoming popular, and the resale value of National IV cars is dropping quickly, with more and more restricted zones. Understanding this standard can help avoid usage troubles, such as checking the emission level during vehicle transfer, which is very important.