Bath & North East Somertset Council

Minimum emission standards

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Vehicles that are electric, low emission or conform to more recent euro standards should emit less pollution than older vehicles.

Vehicles that meet the following emission standards can therefore travel without charge in Bath’s CAZ and in most other clean air zones in England.

Vehicles compliant with emission standards (no charge)

  • Euro 6/VI diesel vehicles (or newer)
  • Euro 4/IV petrol vehicles (or newer)
  • Fully electric vehicles and hydrogen fuel cell vehicles
  • Hybrid vehicles with engines that are either euro 6 diesel or euro 4 petrol (or newer).

Alternatively fuelled vehicles and non-compliant hybrids

Alternatively fuelled vehicles and earlier hybrids can also travel without charge in Bath's CAZ, but must be registered with the council. See 'Registering vehicles' below. They may be charged in other zones.

Private cars and motorbikes

Private cars and motorbikes (excluding taxis and PHVs) are not charged in Bath's CAZ, regardless of emissions (even if they're used for work). They could be charged in other clean air zones. 

However, cars that were first registered between March 2001 and January 1980 (classed PLG on a V5 form) must register with the council to avoid charges. See 'Registering vehicles' below.

Modified or retrofitted vehicles

If your vehicle has been modified or retrofitted to meet these standards, it must be accredited by the Energy Saving Trust’s Clean Vehicle Retrofit Accreditation Scheme (CVRAS) to avoid being charged. Please ask your fitter for details. Once accredited your vehicle will be exempt from charges nationally.

Non-compliant vehicles (charges apply)

Vehicles that fail to meet Bath’s emission standards are non-compliant. These vehicles will be charged in Bath’s CAZ unless the vehicle is a private car or motorbike or the vehicle is covered by an exemption.

This includes non-UK vehicles.

Non-compliant, higher emission vehicles are:

  • Pre euro 6/VI diesel vehicles (i.e. Euro 1 to 5/IV or earlier)
  • Pre euro 4/IV petrol vehicles (i.e. Euro 1 to 3 or earlier)


Charges will apply to non-compliant vehicles midnight to midnight, every day of the year:

  • £100 per day for non-compliant buses, coaches and HGVs
  • £9 per day for non-compliant minibuses, taxis, private hire vehicles, LGVs and vans (including pick-ups, campervans, motorhomes and horse transporters).

Please also see Charges in Bath's CAZ and Payment and enforcement.

Registering vehicles

Certain vehicles must be registered with the council ahead of the zone's launch to avoid unecessary charges. These include:

  • Private cars that are were first registered between March 2001 and January 1980 (classed PLG on a V5 form)
  • Larger motorhomes and horseboxes classed PHGV on a V5 form, entitled to a reduced rate of £9 per day (rather than £100) 
  • Vehicles eligible for a local exemption including:  
    • Alternatively fueled vehicles
    • Hybrid vehicles with pre-euro 6 diesel or pre-euro 4 petrol engines 
    • Hard to replace and special vehicles
    • Vehicles used to support vulnerable groups including emergency vehicles

For more information see Exemptions and discounts.

How to establish your vehicle’s euro standard

Your vehicle’s euro standard depends on your vehicle and when it was manufactured. As a guideline:

 For petrol vehicles:

  • Euro 4 became mandatory for all new cars in 2005 and for light duty vans in 2006.

 Please therefore double check the euro standard of any petrol taxi, van or camper etc. that is registered before 2006 or that’s 13 years or older.

 For diesel vehicles:

  • Euro 6 became mandatory for all new HGVs and buses from January 2014
  • Euro 6 became mandatory for cars and light duty vans from September 2015
  • Euro 6 became mandatory for larger vans up to and including 3.5 tonnes gross vehicle weight from September 2016.

 Please therefore double check the euro standard of any diesel vehicle that’s 3 years old or older.

If your vehicle was first registered after these dates, it’s unlikely to be subject to a CAZ charge.

To check your euro standard please consult your vehicle’s V5 form (or check with the manufacturer). 

What is a euro standard?

A euro standard (e.g. Euro 6/VI) represents the amount of pollution emitted by a vehicle’s exhaust. A higher euro number indicates that the engine is newer and its emissions are cleaner. A lower euro number means the engine is older and more polluting. Diesels create more NO2 than petrol vehicles.

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