What is the difference between National IV and National V vehicle emission standards?
1 Answers
Differences between National IV and National V vehicle emission standards: 1. Different nitrogen oxide (NOx) emission standards: National IV vehicles have an NOx emission standard of 0.25g per kW; National V vehicles have an NOx emission standard of 0.18g per kW. 2. Different particulate matter (PM) concentration emission standards: National IV vehicles have a PM emission standard of 0.025g per kW; National V vehicles have a PM emission standard of 0.0045g per kW. 3. Different non-methane hydrocarbon (NMHC) emission standards: National IV vehicles have an NMHC emission standard of 0.3g per kW; National V vehicles have an NMHC emission standard of 0.23g per kW.