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Euro Emissions Standards
If a car is to be sold in Europe, it must conform with Euro emissions standards
Euro Emissions Standards

The European emissions standards set the acceptable limit for exhaust emission of new
vehicles in European states. New vehicles sold after the date shown for each standard
must be within the standards or it cannot be legally sold in European Union states.

Legal Emissions Output

Numbers are g/km (Grams output per Kilometer).

  Date Carbon Monoxide Hydrocarbons Non Methane Hydrocarbons Nitrogen Oxide HC+NOx Particulates

Diesel
Euro 1   07/1992 2.72 - - - 0.97 0.14
Euro 2   01/1996 1.0 - - - 0.7 0.08
Euro 3   01/2000 0.64 - - 0.50 0.56 0.05
Euro 4   01/2005 0.50 - - 0.25 0.30 0.025
Euro 5   09/2009 0.500 - - 0.180 0.230 0.005

Petrol
Euro 1   07/1992 2.72 - - - 0.97 -
Euro 2   01/1996 2.2 - - - 0.5 -
Euro 3   01/2000 2.3 0.20 - 0.15 - -
Euro 4   01/2005 1.0 0.10 - 0.08 - -
Euro 5   09/2009 1.000 0.100 0.068 0.060 - 0.005

Testing Emissions Output

The manufacturer of the vehicle sends a few examples of each engine type to a specialist test
centre where they run emissions tests and give the engine type either a pass or a fail. If it passes,
the manufacturer can then sell that model with that engine for as long as they like without a
retest (unless the standards are updated or the engine is modified by the manufacturer).

What Euro Rating Is My Smart?

Car Type Engine Capacity From To Euro Standard
Fortwo 600cc petrol 1998 2003 Euro 3
Fortwo 700cc petrol 2003 2007 Euro 4
Fortwo (450) 800cc diesel 2000 2004 Euro 4
Fortwo (450) 800cc diesel 2004 2007 Euro 4
Fortwo (451) 800cc diesel 03/2007 07/2009 Euro 4
Fortwo (451) 800cc diesel 07/2009 on Euro 5
Fortwo 45kw 999cc petrol 03/2007 05/2008 Euro 4
Fortwo MHD 45kw 999cc petrol 05/2008 on Euro 5
Fortwo 52kw 999cc petrol 03/2007 05/2008 Euro 4
Fortwo MHD 52kw 999cc petrol 08/2008 on Euro 5
Fortwo 62kw turbo 999cc petrol 03/2007 on Euro 5
Fortwo Brabus 999cc petrol 03/2007 on Euro 5
Roadster 700cc petrol 04/2003 12/2005 Euro 4
Forfour All 01/2004 06/2006 Euro 4

How Does This Affect Me?

It doesn't affect you really. Even if you remap the car, put a new exhaust on it or squeeze more power from it, it does not ever need to be retested for the Euro emissions standards. From the
point you buy the car, the Euro emission standard number is set and will not change. This can
go both ways though as adding a Euro5 exhaust will not change your emissions rating.

The only emission standard you have to conform to is the one performed on the MOT every year.

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