With London's ultra low emissions zone (ULEZ) set to expand at the end of the month, the area will creep closer than ever to Hertfordshire's borders.

A group of five Conservative-led councils lost a High Court challenge against plans to expand the capital's ULEZ on Friday, July 28.

The zone will now expand on Tuesday, August 29, and will cover every London borough.

This means that a charge of £12.50 a day will be required to drive a vehicle that is not exempt in the zone. 


The ULEZ will now cover Barnet and its edge touches Rickmansworth, the outskirts of Watford, Borehamwood, the interior of the M25 at Potters Bar, Waltham Cross and Waltham Abbey.

Welwyn Hatfield Times: The zone touches Potters Bar, Borehamwood and Watford.The zone touches Potters Bar, Borehamwood and Watford. (Image: TfL / Google Maps)

London's mayor Sadiq Khan praised the High Court's decision.

He commented: "This landmark decision is good news as it means we can proceed with cleaning up the air in outer London on August 29.

"The decision to expand the ULEZ is was very difficult and not something I took lightly, and I continue to do everything possible to address any concerns Londoners may have.


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"The ULEZ has already reduced toxic nitrogen dioxide air pollution by nearly half in central London, and a fifth in inner London.

"The coming expansion will see five million more Londoners being able to breathe cleaner air."

Vehicles can be checked online at the TfL website, to see whether they are exempt from the ULEZ charges.