Is China 5 the same as China V?

[DeEsther]

China 5 is indeed China V, where the 'V' in China V refers to the Roman numeral representing the number five. This was a numeral system used in Europe before the introduction of Arabic numerals and is less commonly used today. The China V standard, also known as the National Fifth Stage Motor Vehicle Pollutant Emission Standard, imposes stricter limits on vehicle emissions such as nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO), and particulate matter (PM). Compared to the China IV standard, the new standard reduces nitrogen oxide emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles. From China I to China IV, each upgrade in the standard has reduced single-vehicle pollution by 30% to 50%.