What New Content Has Been Added to the Vehicle Exhaust Emission Testing Standards?
2 Answers
Both gasoline and diesel vehicles now include additional inspection items such as visual inspection and OBD checks; new testing items and procedures have been added; additional testing record items and software requirements have been introduced; and the content and methods for environmental supervision sampling tests have been clarified. Here are the specific details: 1. Gasoline Vehicles: Gasoline vehicles now include fuel evaporation testing and other items; pollutant emission limits have been adjusted, among other changes. 2. Diesel Vehicles: Diesel vehicles now include nitrogen oxide emission limits and measurement methods, and the soot emission limits have been adjusted; requirements for compression ignition engines and new vehicle type approvals have been removed.
I recently went for an emissions test and found that the new standards have added quite a few requirements. First, they’ve introduced real-time monitoring of nitrogen oxides (NOx), which is stricter than before—NOx levels are measured as soon as the engine starts. Second, the particulate matter limits have been lowered, requiring emissions per kilometer to be controlled at an even stricter level. Third, they’ve intensified the OBD system inspection, ensuring all diagnostic functions are working properly—for example, trouble codes can’t be ignored. This surprised me a bit, as my car’s catalytic converter almost failed the test. I think this is good for the environment, as it helps reduce air pollution and keeps urban air cleaner. But it also reminds car owners to maintain their vehicles proactively and not neglect minor issues. Regular oil changes and air filter checks are essential to avoid last-minute hassles during testing. Otherwise, getting stuck at the inspection station can be both costly and disruptive to daily use.
