What are the differences between National IV and National V emission standards?
1 Answers
The differences between National IV and National V emission standards are: 1. Different release dates: National IV was released on December 30, 2005; National V was released on September 17, 2013. 2. Different stringency levels: Compared with National IV, the National V standard reduces nitrogen oxide (NOx) emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles. Vehicle emission standards regulate the permissible levels of harmful gases emitted from vehicle exhaust, including CO (carbon monoxide), HC (hydrocarbons), NOx (nitrogen oxides), and PM (particulate matter).