What Emission Standard Does National V Represent?

[Albert]

"National V" represents the fifth category of emission standards. The symbol "V" is a Roman numeral, which is the earliest form of numerical representation, originating in Rome over 2000 years before Arabic numerals. For example, Roman numerals: Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ correspond to Arabic numerals 1, 2, 3, 4, 5 respectively. Below is additional information on National V: 1. The National V standard is equivalent to the Euro 5 standard in the European Union, which has been implemented since 2009. It imposes stricter limits on vehicle emissions such as nitrogen oxides, hydrocarbons, carbon monoxide, and particulate matter. Each upgrade from National I to National IV reduces vehicle pollution by 30% to 50%. After review by relevant authorities, the National V standard was implemented nationwide starting from January 1, 2017. 2. The use of new standard gasoline and diesel will reduce multiple pollutants, cutting PM2.5 emissions from National IV to National V. Environmental indicators have been further tightened, with sulfur content reduced from 50ppm to 10ppm, and fuel quality significantly improved. The draft also revised gasoline grades from 90, 93, 97 to 89, 92, 95.