Tier 4

Tier 4 is a classification used in the European Union to define the strictest standards for vehicle emissions, particularly for diesel engines. It ensures that vehicles produce fewer pollutants, such as nitrogen oxides (NOx) and particulate matter, helping to improve air quality and public health. Achieving Tier 4 compliance involves advanced engine technologies and after-treatment systems that significantly reduce emissions. This standard applies mainly to off-road vehicles, construction equipment, and some industrial machinery, aiming to balance operational needs with environmental responsibility.