Car manufacturers have been working hard to drive down vehicle emissions of all types for many years, despite recent scandals. Since 1992, European Union regulations have been imposed on new cars, with the aim of improving air quality. The current Euro 6 emissions standard is the toughest standard yet and has the potential to eliminate the majority of exhaust pollutants that have an impact on air quality*.The aim of Euro emissions standards is to reduce the levels of harmful exhaust emissions: nitrogen oxides (NOx), carbon monoxide (CO) and hydrocarbons (HC). In most of Europe, vehicle emissions are tested as part of their annual/bi-annual vehicle safety check. In some countries, vehicles with high emission levels are deemed as not roadworthy. STP Emissions Reducer is a simple solution to help vehicles pass their emissions test.