Euro emission standards are EU-wide regulations that set maximum limits for pollutants from vehicle engines. Each successive Euro class is stricter than the last. Your vehicle’s Euro class affects where you can drive, your vehicle tax, and resale value.
The Euro Classes
Euro 1–3: older standards, significant pollutant emissions. Vehicles from these eras face restrictions in Swedish environmental zones and some European cities. Euro 4: introduced around 2005–2006, significant improvement in particulate and NOx limits. Euro 5: from 2009–2011, further reduction — most modern diesel particulate filter (DPF) requirements stem from this class. Euro 6: from 2014, current standard — very low NOx and particulate limits. Euro 6d: the most current variant, tested under real-world driving conditions (RDE), not just in laboratory conditions.
Why It Matters
Euro class determines eligibility for environmental zones, affects the annual vehicle tax (fordonsskatt) in Sweden, and in some cases qualifies for free parking or reduced congestion charges.
Exam tip: Euro 6 is the current standard. Older Euro classes produce more NOx and particulates — the pollutants most harmful to urban air quality.