What is the difference between National 5 and National 6 standards for small cars?
1 Answers
The differences between National 5 and National 6 standards for small cars are: 1. Different restrictions: The carbon monoxide emission limit for National 5 standard gasoline vehicles is 1000 milligrams per kilometer; for National 6 standard gasoline vehicles, it's 700 milligrams per kilometer. 2. Different emission standards: National 5 standard reduces nitrogen oxide emissions from light vehicles by 25% compared to National 4; National 6 standard reduces particulate emissions by 40% compared to National 5. Vehicle emission standards are established to implement environmental protection laws, reduce and prevent pollution from vehicle exhaust, protect the ecological environment, and ensure human health. These standards aim to control harmful emissions including CO (carbon monoxide), HC (hydrocarbons), NOx (nitrogen oxides), and PM (particulates, soot) from vehicle exhaust.