Just copied this from the London LEZ website.
Ways to meet the LEZ standards
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If your vehicle doesn't meet the Low Emission Zone (LEZ) emissions standards, there are things you may be able to do.
Replace your vehicle
You could upgrade to a newer vehicle that meets the standards or an electric vehicle. Find out more about
replacing your vehicle.
Retrofit your vehicle
Check your vehicle to see if it meets the LEZ emissions standards. If it doesn't, you may be able to retrofit your vehicle with emissions reduction technology.
Emissions reduction technology
Emissions reduction technologies include:
- Selective catalytic reduction, which reduces NOx emissions
- Replacement Euro VI engines
- Converting a vehicle to electric power
Retrofit technologies need to be approved by the
Clean Vehicle Retrofit Accreditation Scheme (CVRAS). This government scheme, funded by Defra, establishes common standards for all Clean Air Zone cities.
CVRAS has certified emissions reduction technologies for certain buses, coaches, HGVs, and refuse vehicles.
As retrofits need to be calibrated to specific vehicle models, and not all vehicles can be covered. We expect more conversions to be available in the future.
Information about the retrofit process and a list of suppliers is on
the CVRAS website.
Even if your vehicle has been fitted with emissions reduction technology, it may take up to seven days after installation for your vehicle record to update. If after seven days our vehicle checker continues to show your vehicle as chargeable, please check that your retrofit manufacturer has notified us of the installation.
Until our vehicle checker shows your vehicle as non-chargeable, you must continue to pay the LEZ daily charge when driving in the zone. These charges are non-refundable.
Vans and diesel particulate filters
Note that installing a filter does
not guarantee your vehicle will meet these LEZ standards or the
ULEZ standards.
Information for manufacturers and fitters
To offer approved devices and services, manufacturers and fitters must be accredited by the
Clean Vehicle Retrofit Accreditation Scheme (CVRAS).