Daily Junction.mobi portalNews · January 18, 2024 · Daily Junction Editorial Team · 12 min
London's Ultra Low Emission Zone expanded to cover all boroughs in August 2023, affecting 5 million additional residents. The £12.50 daily charge for non-compliant vehicles has improved air quality but sparked fierce political debate, legal challenges, and concerns about the impact on low-income drivers in outer London.
On 29 August 2023, London's Ultra Low Emission Zone (ULEZ) expanded to cover all 32 boroughs, extending clean air regulations to an area 18 times larger than the original central London zone and affecting approximately 5 million additional residents. The expansion, championed by Mayor Sadiq Khan as essential to tackle London's air quality crisis, has become one of the most politically contentious transport policies in recent UK history. It has improved air quality, reduced polluting vehicles, and generated revenue for public transport—but it has also sparked fierce opposition, legal challenges, widespread vandalism of enforcement cameras, and contributed to a shock by-election defeat for Labour in July 2023.
The ULEZ expansion represents a fundamental tension in modern transport policy: how to balance urgent public health needs against the financial burden on low-income households, particularly in outer London where car dependency is higher and public transport alternatives are weaker. Six months after implementation, the evidence shows measurable air quality improvements, but the political and social costs remain deeply contested.
The Ultra Low Emission Zone was introduced in central London in April 2019, replacing the older T-Charge (Toxicity Charge). It charges drivers of the most polluting vehicles £12.50 per day to enter the zone, operating 24 hours a day, 7 days a week. The charge is in addition to the Congestion Charge (£15 per day, weekdays only) in central London.
Vehicles must meet minimum emissions standards to avoid the charge:
Electric vehicles, hydrogen vehicles, and some hybrid vehicles are exempt. Drivers can check if their vehicle is compliant using Transport for London's online checker, which uses DVLA registration data.
The zone was expanded to the North and South Circular roads in October 2021, covering inner London. The August 2023 expansion extended it to all London boroughs, including outer areas like Bromley, Havering, Hillingdon and Sutton—suburban and semi-rural areas where car ownership is higher and public transport is less comprehensive than inner London.
The case for ULEZ rests on a stark public health reality: air pollution kills. Public Health England estimates that long-term exposure to air pollution contributes to 40,000 premature deaths per year in the UK, with around 4,000 in London alone. The primary culprits are nitrogen dioxide (NO2) and particulate matter (PM2.5 and PM10), both produced by vehicle emissions, particularly from diesel engines.
London has consistently breached legal limits for NO2 set by UK and EU law. In 2019, before the pandemic, over 2 million Londoners lived in areas exceeding WHO guidelines for NO2. Roadside monitoring stations in high-traffic areas recorded levels two to three times the legal limit. Children in schools near busy roads showed reduced lung development, and hospital admissions for asthma and respiratory conditions were significantly higher in polluted areas.
The health impacts are not evenly distributed. Deprived communities and ethnic minority groups are disproportionately exposed to air pollution, as they are more likely to live near busy roads and industrial areas. A 2020 study by Imperial College London found that Black Londoners were exposed to NO2 levels 10% higher than the London average, and Asian Londoners 8% higher.
ULEZ was designed to tackle this crisis by incentivising the replacement of the most polluting vehicles—older diesels and petrol cars—with cleaner alternatives. The original central London zone reduced NO2 concentrations by 44% in the first two years, according to TfL data. The expansion to inner London in 2021 produced further reductions. The 2023 expansion aimed to extend these benefits to outer London, where air quality had improved more slowly.
Six months after the August 2023 expansion, the evidence shows measurable improvements in air quality across outer London:
Independent analysis by Imperial College London, published in January 2024, confirmed these findings. Researchers compared air quality data from outer London monitoring stations before and after the expansion, controlling for weather, traffic levels, and seasonal variations. They found statistically significant reductions in NO2 and PM2.5 at the majority of sites, with the largest improvements near major roads.
However, isolating ULEZ's specific impact is challenging. Vehicle fleets are naturally becoming cleaner as older cars are scrapped and replaced with newer, less polluting models. Some of the improvement would have occurred without ULEZ. Critics also point out that air quality is influenced by many factors—weather, traffic levels, construction activity—and that attributing all improvements to ULEZ overstates its impact.
Nonetheless, the speed and scale of the reduction in non-compliant vehicles—60% in six months—suggests ULEZ accelerated the transition significantly. Without the charge, many drivers would have continued using older vehicles for several more years.
The ULEZ expansion became a political lightning rod. Opposition came from multiple directions:
1. Outer London boroughs: Five Conservative-led outer London councils—Bexley, Bromley, Harrow, Hillingdon, and Sutton—launched a legal challenge, arguing that the Mayor lacked the authority to impose ULEZ on their residents and that the consultation was inadequate. The High Court rejected the challenge in July 2023, ruling that Khan had acted lawfully.
2. Conservative Party: The Conservatives made opposing ULEZ a central campaign theme, framing it as a "war on motorists" and a tax on working families. Prime Minister Rishi Sunak intervened personally, calling the expansion "the wrong approach" and pledging to support drivers. The party used ULEZ as a wedge issue to attack Labour, particularly in outer London marginal seats.
3. Grassroots opposition: A loose coalition of residents, small business owners, and anti-ULEZ campaigners organised protests, lobbied councillors, and vandalised enforcement cameras. By January 2024, over 1,000 ULEZ cameras had been damaged, stolen, or destroyed, costing TfL millions in repairs and replacements. Some vandals were prosecuted, but enforcement proved difficult.
4. The Uxbridge by-election: In July 2023, Labour lost the Uxbridge and South Ruislip by-election to the Conservatives, a seat they had been expected to win. Exit polls and post-election analysis identified ULEZ as a key factor. Voters in the outer London constituency, where car ownership is high and public transport limited, rejected Labour in part due to anger over the expansion. The result shocked Labour and emboldened Conservative opposition to ULEZ.
The political fallout was significant. Some Labour MPs called on Khan to delay or scale back the expansion. However, Khan pressed ahead, arguing that the public health case was overwhelming and that delaying would cost lives. The expansion went ahead as planned on 29 August 2023.
The most contentious aspect of ULEZ is its impact on low-income households and outer London residents. Critics argue that the policy is regressive, hitting those least able to afford it:
1. Older, cheaper cars are more likely to be non-compliant: A 2023 analysis by the RAC Foundation found that 60% of cars worth less than £2,000 did not meet ULEZ standards, compared to 10% of cars worth over £10,000. Low-income families who rely on older, cheaper vehicles face a stark choice: pay £12.50 per day (£4,562.50 per year if driven daily), scrap the car and buy a compliant replacement, or stop driving.
2. Outer London has higher car dependency: In inner London, 48% of households do not own a car, and public transport is comprehensive. In outer London, only 25% of households are car-free, and many areas have limited public transport. Residents in boroughs like Havering, Bromley, and Hillingdon argue they have no realistic alternative to driving for work, school runs, or caring responsibilities.
3. The scrappage scheme is insufficient: The £110 million scrappage scheme offers up to £2,000 for scrapping a non-compliant car, but this is often not enough to buy a compliant replacement. A reliable Euro 6 diesel or Euro 4 petrol car typically costs £5,000-£10,000. For families on low incomes, finding the additional £3,000-£8,000 is prohibitive. Some have been forced to take on debt, reduce working hours, or give up their car entirely.
4. Small businesses and tradespeople are hit hard: Plumbers, electricians, carers, and other tradespeople who rely on vans face costs of up to £7,000 to replace non-compliant vehicles. While the scrappage scheme offers higher grants for businesses, many report that it does not cover the full cost of replacement, and that newer vans are less reliable or suitable for their work.
Supporters of ULEZ counter that:
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