South America; North America; Asia; Oceania; Europe
Argentina; Australia; Brazil; Canada; Chile; China; EU member countries; India; Japan; Mexico; Peru; Russia; South Korea; Switzerland; Thailand; United States; Vietnam
Vehicle Emission Standards for NOx require that cars sold in the countries meet approved car emission standards by reducing the levels of nitrogen dioxides emissions from motor vehicles. Currently, 18 regions around the world have developed and implemented seperate regulations to limit the emissions from light-duty vehicles (LDVs) and heavy-duty vehicles (HDVs). With some exceptions, notably the countries of North America and Japan, most countries follow the European precedent for emission standards, with modified timelines according to local conditions. Some countries also follow the United States' precedent (i.e. Canada). Japan currently uses a regulatory framework that differs from that of either the United States or the European Union, which is the more stringent in terms of NOx limits for light-duty vehicles. For heavy-duty vehicles, the California Air Resources Board adopted an optional low-NOx standard for on-road heavy-duty engines in December 2013. It set optional NOx limits at 0.1 g/hp-hr, 0.05 g/hp-hr and 0.02 hp-hr which are significantlly lower than current US federal NOx limit (0.2 hp-hr) as well as the other regions in the world.
The NOx Exhaust Emission Standards for Vehicles help reduce nitrogen oxides that vehicles emit and are then deposited to water bodies through atmospheric deposition.
Emission Standards for Vehicles