London air quality improves, but pollution gap persists

London's air quality has seen substantial improvements over the past decade, with average nitrogen dioxide (NO₂) levels decreasing by almost 38% since 2014. This progress means every London neighbourhood now meets the UK's legal limit for NO₂, an annual average of 40 micrograms per cubic meter (µg/m³). However, a significant gap persists when compared to international health recommendations, as fewer than 1% of neighbourhoods meet the World Health Organization’s (WHO) guideline of 10 µg/m³.

Persistent inequalities in air quality

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Despite overall improvements, areas that are more deprived and those with larger non-white populations experienced some of the most significant reductions in air pollution. These neighbourhoods, however, began with considerably higher levels of NO₂ and continue to be among the most polluted parts of the capital. Rosamund Adoo-Kissi-Debrah, whose daughter Ella became the first person in the UK to have air pollution listed on her death certificate, stated, "We don't all breathe the same air."

Ella Adoo-Kissi-Debrah, who lived in Lewisham, died of an asthma attack in 2013. An inquest into her death concluded there was a "recognised failure to reduce the level of nitrogen dioxide to within the limits set by EU and domestic law." Professor Sir Stephen Holgate, who examined Ella's medical papers, concluded that high pollution levels in her neighbourhood contributed to her asthma's severity and her death. He noted that air pollution is often discussed as an environmental issue rather than a health one.

The WHO highlights that air pollution can impact nearly every organ in the body. The Royal College of Physicians estimated that air pollution contributed to 30,000 deaths in the UK in 2025 and incurs an annual economic cost exceeding £27 billion. Professor Holgate suggested that communities with poorer health and living conditions are more vulnerable to pollution, explaining why inequalities persist even as overall pollution decreases.

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Policy impacts and ongoing debate

A spokesperson for the Department for Environment, Food and Rural Affairs (Defra) affirmed the government's commitment to reducing air pollution through measures such as cleaner transport and stricter emissions standards. Multiple clean-air policies implemented between 2014 and 2024, including cleaner buses, a shift to lower-emission vehicles, and London's Ultra Low Emission Zone (ULEZ), have been associated with positive outcomes. Research indicates that the T-Charge and the original central London ULEZ were linked to reductions in emergency hospital admissions among adults within the zones. Furthermore, a recent study found that deaths linked to air pollution in London fell by an estimated 40% over five years from 2019.

A spokesperson for the Mayor of London stated that the ULEZ has been successful in improving air quality, with harmful roadside NO₂ concentrations 24% lower in outer London compared to a scenario without the ULEZ. They added that while all Londoners are breathing cleaner air, further action is planned. Steve McNamara, general secretary of the Licensed Taxi Drivers' Association, noted a tangible difference, stating, "You can actually breathe the difference."

However, the ULEZ expansion in 2023 has generated controversy. Maria Melucci, owner of an Italian deli in Bexley village, reported that many customers from outside the ULEZ area now face the daily £12.50 charge to visit her shop. While acknowledging the necessity of tackling air pollution, she questioned the policy's financial burden on less affluent individuals, stating, "Charging poor people is not the solution." She also raised concerns about the logic of charging rather than removing polluting vehicles from the road.

Gavin Davies, GMB union senior organiser, expressed support for cleaner air but argued for greater protection for frontline workers from ULEZ costs. He highlighted challenges faced by NHS workers who may struggle to afford compliant vehicles or rely on public transport, especially during unsocial hours. Some staff working shifts that cross midnight have reported being charged the ULEZ fee twice, creating an unfair burden. The union advocates for ULEZ discounts for NHS and frontline workers, along with schemes to help them purchase compliant vehicles.

What happens next

While London's air quality has improved significantly, the debate continues regarding the fairness of policies like the ULEZ and the need for further measures to address persistent pollution inequalities and protect vulnerable populations.