In the late 1980s, leading European countries almost simultaneously embarked on a course of environmental security. One of the key areas of environmental policy was the fight against the toxicity of exhaust gases from cars.

SCR – exhaust gas aftertreatment system by spraying an aqueous AdBlue solution into the vehicle’s exhaust system to reduce emissions to Euro 5 levels.

In European countries, the environmental standard Euro 4 has been in effect since 2004, followed by Euro 5 from September 2009. These standards aim to reduce the amount of harmful emissions released into the atmosphere to the following levels: particulate matter (PM) to 0.05 g/km, carbon monoxide (CO) to 0.8 g/km, and nitrogen oxides (NOx) to 0.06 g/km.