What is the equivalent of iv in national emission standards?
2 Answers
iv is equivalent to the China IV standard, officially known as the National Fourth Stage Emission Standard for Motor Vehicle Pollutants. Below is expanded information about national emission standards: 1. Vehicle emission standards regulate the permissible levels of harmful gases emitted from vehicle exhaust, including CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulate matter, soot). 2. The symbols for China I to China VI standards are I, II, III, IV, V, and VI respectively. The implementation of vehicle pollutant emission standards aims to reduce vehicle exhaust emissions and minimize environmental pollution. 3. The China VI emission standard represents the strictest emission regulation in China to date. It is divided into two phases: China VIa and China VIb, which were scheduled for nationwide implementation on July 1, 2020, and July 1, 2023, respectively.
I've been driving for twenty years and have always been concerned about emission standards. China IV refers to the fourth stage of China's emission standards, generally implemented around 2008, with the goal of reducing harmful substances in vehicle exhaust, such as carbon monoxide and nitrogen oxides. I remember when the upgrade happened, many experienced drivers replaced their old cars because China IV required vehicles to be equipped with better three-way catalytic converters for more thorough exhaust treatment. Compared to the previous China III standard, China IV imposed stricter limits, significantly reducing emissions. Nowadays, China IV vehicles are considered old. While they still run smoothly in second-tier cities like mine, there are restrictions in major cities like Beijing, Shanghai, and Guangzhou. I recommend choosing China V or China VI vehicles when buying used cars—they're more environmentally friendly, fuel-efficient, and easier to drive in cities. The upgrade in emission standards is a good thing, protecting the environment while making vehicles run cleaner. I used to own a 2005 China III vehicle, but now I've switched to a China VI electric car, and the difference is quite noticeable.
