What emission standard does IV correspond to?
4 Answers
IV corresponds to the China IV emission standard, which is the national fourth-stage motor vehicle pollutant emission standard. Vehicles meeting the China IV standard must reduce pollutants by an additional 30% to 50% compared to China III standards to comply. Automotive emissions refer to harmful gases such as CO, HCNOx, and PM discharged from exhaust. Technologies like improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices are applied to control and reduce vehicle emissions below specified limits. Any new compression-ignition vehicles failing to meet China IV standards cannot be registered.
When someone asks about the IV national emission standard, I need to explain it from a car owner's daily experience. National IV is actually China's fourth-stage vehicle emission standard, which has been implemented for many years. As an ordinary driver, I always pay special attention to this standard when choosing a car or doing maintenance, because it directly affects road access and peace of mind. For example, in big cities like Beijing and Shanghai, if you drive a National III or older vehicle, you might be restricted from entering core urban areas, while National IV vehicles can still move freely—though by 2023, many places started phasing out National IV. The standard requires vehicles to reduce exhaust emissions, specifically targeting pollutants like CO and NOx, which significantly improves air quality. Since 2015, I've been driving a National IV car and find it both fuel-efficient and eco-friendly. I recommend checking the environmental label before buying a used car—don’t just go for a cheap but outdated model. Overall, keeping up with national standards makes driving smoother and saves on repair costs, killing two birds with one stone.
As a tech enthusiast, I enjoy explaining that China IV standard stands for the National Fourth Stage Motor Vehicle Emission Standard, formulated by China's environmental protection authorities. This regulation focuses on vehicle exhaust control, setting strict limits for pollutants like carbon monoxide and hydrocarbons, and requiring new vehicles to be equipped with OBD diagnostic systems for automatic emission monitoring. Through my research on such details, I've found that implementing China IV necessitated upgrades to engines and exhaust systems, such as adding EGR valves or catalytic converters to meet requirements. Common repair issues like clogged converters or faulty sensors can cause vehicles to fail annual inspections, reminding fellow drivers to perform regular maintenance rather than waiting for problems to arise. Technically speaking, China IV marked progress over China III but falls short of China VI in environmental protection. As drivers, we should stay informed about new regulations to maintain vehicle performance.
From an environmental perspective, the China IV standard is the fourth phase of vehicle emission limits introduced by the state, aiming to reduce air pollution. As someone who cares about green transportation, I understand that this standard requires vehicles to emit fewer pollutants such as PM2.5 and sulfides, helping to alleviate urban smog issues. In reality, after the implementation of China IV, air quality has slightly improved. Choosing vehicles with higher emission standards is a responsible choice for public health. I support opting for China VI-compliant vehicles or electric cars, as phasing out older vehicles can reduce carbon emissions. Starting with small steps, we can leave a bluer sky for future generations.
