What is the national standard for vehicle exhaust emission testing?
4 Answers
The current testing standard is the Euro IV standard implemented since 2005: HC less than 0.46%, CO less than 1.50%, NOX less than 3.50%, PM less than 0.02%. Below is additional information: 1. China V: The National Fifth Stage Vehicle Pollutant Emission Standard, referred to as the "China V Standard," has an emission control level equivalent to the European Union's currently implemented Stage 5 emission standard. The EU has been enforcing this standard since 2009, which imposes stricter limits on vehicle emissions such as nitrogen oxides, hydrocarbons, carbon monoxide, and suspended particles. From China I to China IV, each upgrade in the standard reduces single-vehicle pollution by 30% to 50%. 2. China VI: The China VIa emission standard stipulates that carbon monoxide emissions must not exceed 700 mg per kilometer, non-methane hydrocarbons must not exceed 68 mg per kilometer, nitrogen oxides must not exceed 60 mg per kilometer, and PM fine particles must not exceed 4.5 mg per kilometer. The China VIb emission standard requires carbon monoxide emissions to not exceed 500 mg per kilometer, non-methane hydrocarbons to not exceed 35 mg per kilometer, nitrogen oxides to not exceed 35 mg per kilometer, and PM fine particles to not exceed 3 mg per kilometer.
When it comes to the national standards for vehicle exhaust emissions testing, as ordinary car owners, what we care about most is not getting stuck during the annual inspection. The national standard, mainly GB 18352.6-2016 (also known as China 6 standard), stipulates that harmful substances emitted by vehicles during operation must not exceed the limits, such as carbon monoxide below 1.0 grams per kilometer and nitrogen oxides below 0.06 grams per kilometer. These limits are set to protect the environment, reduce smog, and lower health risks. During my annual inspection last year, the testing station used instruments to measure the exhaust. If it exceeded the standard, repairs or a catalytic converter replacement were required. The new national standard encourages the purchase of more environmentally friendly vehicles, which also saves money on maintenance because cars with better emissions burn fuel more cleanly and have fewer faults. However, it's important to maintain your car well and avoid using low-quality fuel. In short, the standard is the foundation; complying with it not only makes things easier for yourself but also improves air quality.
When working at the repair shop, I often observe critical details of exhaust emission testing. National standards like China VI are highly specific—for instance, gasoline vehicles must not exceed 0.3% CO concentration or 100ppm HC at idle. During testing, an exhaust gas analyzer is inserted into the tailpipe, and data must comply with GB standards in real time. Common causes of exceeding limits include a deteriorating catalytic converter or faulty oxygen sensor, requiring prompt replacement. These standards not only enforce strict limits but also encourage drivers to adopt cleaner technologies like three-way catalytic systems. This significantly benefits the environment. Routine maintenance is easily overlooked, but attention to these details can prevent annual inspection hassles. Overall, standards serve as tools—it takes joint effort from technicians and vehicle owners to implement them effectively, making the automotive industry greener and smoother.
Paying attention to the national standards for vehicle exhaust emissions testing, I believe it can significantly improve the environment. The China VI standard strictly controls pollutant emissions, reduces urban smog, and ensures safer breathing for everyone. By complying with it, car owners not only protect their own health but also contribute to promoting a low-carbon transformation in society. Simply put, the standard is a public policy that requires the support of each and every one of us.
