Which National Emission Standard Vehicles Are Banned from Roads?

[VanAubrey]

In most cities, vehicles meeting National II emission standards are prohibited from road use, with some cities also restricting National III and National IV vehicles. However, National III and National IV vehicles are generally permitted on roads in most regions or cities. Starting from 2019, numerous cities and regions across the country have gradually implemented the National VI standard, widely regarded as the most stringent emission standard to date. National VIa standard stipulates: Gasoline vehicles must not emit more than 700 milligrams of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 68 milligrams of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 60 milligrams of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 4.5 milligrams of PM (particulate matter) per kilometer driven. National VIb standard stipulates: Gasoline vehicles must not emit more than 500 milligrams of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 35 milligrams of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 35 milligrams of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 3 milligrams of PM (particulate matter) per kilometer driven.