What are the symbols from National 1 to National 6?
1 Answers
The symbols from National 1 to National 6 are I, II, III, IV, V, and VI respectively. On July 1, 2000, China first introduced the National 1 emission standard. Since it was based on European emission standards and aligned with international standards, Roman numerals were adopted for the symbols from National 1 to National 6. New emission standards have been introduced every few years since then. Relevant information about automotive emission standards is as follows: 1. Introduction: Automotive emission standards refer to regulations on the content of harmful gases emitted from vehicle exhaust, such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulate matter, soot). 2. Implementation: Starting from January 1, 2004, Beijing upgraded the vehicle emission standards from Euro I to Euro II. By 2008, the Euro III standard was officially implemented.