What are the vehicle emission inspection standards?

[DelJack]

Vehicle emission inspection standards: Carbon monoxide: A (700mg/km); B (500mg/km); Non-methane hydrocarbons: A (68mg/km); B (35mg/km); Nitrogen oxides: A (60mg/km); B (35mg/km); PM particulate matter: A (4.5mg/km); B (3mg/km). General process for vehicle emission inspection: 1. Information entry: The computer inputs information, registers vehicle details, and automatically assigns an inspection line based on vehicle characteristics. 2. Designated inspection line: Dispatchers direct staff to drive the vehicle to the assigned inspection line; supervisors cannot alter the inspection route. 3. Inspection line confirmation: The control room verifies if the vehicle has entered the correct inspection line; without confirmation, the next step cannot proceed. 4. Emission testing: Inspectors follow on-screen prompts to conduct the test correctly. Results are matched against standard values and uploaded to the server. 5. Payment: Finally, pay fees at the environmental inspection office. Non-compliant vehicles require rectification before retesting. Qualified vehicles receive an environmental certification mark.

[LeLillian]

Vehicle exhaust emission standards are primarily established to control the emission of pollutants from automobiles. The commonly referenced standards include testing for harmful gases such as carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter (PM). For instance, China's National VI standard is quite stringent, with CO concentration capped at a maximum of 0.1 grams per kilometer—exceeding this limit will result in a failed annual inspection. As a mechanic, I often encounter vehicles that exceed the limits due to damaged catalytic converters or faulty oxygen sensors, which negatively impact air quality. These standards have been progressively upgraded from National I to National VI, with increasingly tighter limits aimed at reducing smog and acid rain. Testing involves measurements during both idle and acceleration conditions, highlighting the importance of regular maintenance: simple practices like cleaning fuel injectors and replacing air filters can help lower emissions. I believe these standards are more than just regulations—they drive technological advancements, encourage the adoption of clean-energy vehicles, and contribute to making cities more livable.

[DelCameron]

As someone who cares about the environment, I think emission standards are very important. These standards set the maximum limits for pollutants such as nitrogen oxides and carbon monoxide. Currently, the China VI standard imposes strict requirements on gasoline vehicles, with HC limits set very low, and non-compliant vehicles are not allowed on the road. Professional equipment is used during testing to simulate real driving conditions. I know many friends whose cars failed inspections due to emission issues, resulting in costly repairs like replacing oxygen sensors. The upgrade of standards is a good thing—it reduces air pollution and improves our health. It's advisable to pay attention to regular vehicle maintenance, such as timely oil changes and avoiding prolonged idling. Promoting electric vehicles is also a solution. Environmental standards make society more sustainable.

[Thompson]

Exhaust emission testing standards are common during annual inspections. Based on my years of driving experience, the core principle is that harmful substances like carbon monoxide and hydrocarbons must not exceed limits. The China VI standard specifies numerical limits for CO. The testing process is simple—just drive the car into the station for an instrument measurement. If readings are high, the most common issues are worn spark plugs or abnormal air-fuel ratios. I've encountered this myself—after repairs, it passed. Regular maintenance like cleaning the throttle body is very helpful. These standards protect the environment, and we should all comply.