Researchers at Imperial College found that emergency hospital admissions declined following London's introduction of the Congestion Charge (T-charge) and the Ultra Low Emission Zone (ULEZ). Scientists analysed health records spanning periods before and after both air pollution reduction schemes took effect.

The study adds to mounting evidence that low emission zones deliver measurable public health benefits. Bradford's clean air zone produced a 25% reduction in GP visits for heart and breathing problems in its first year, according to research published in Environmental Research. The zone also generated NHS savings exceeding 30,000 pounds monthly.

London's Congestion Charge, introduced in 2003, targeted vehicles entering central London and collected fees from high-emission cars. ULEZ, which launched in April 2019 and expanded in October 2021, banned older diesel and petrol vehicles from the capital unless they meet emission standards.

Imperial College researchers compared hospital admission data from before these schemes went live against admission rates after implementation. The analysis focused on respiratory and cardiovascular conditions, which show the strongest association with air pollution exposure.

Air quality in London deteriorated significantly during the 20th century due to vehicle emissions and industrial activity. Nitrogen dioxide and particulate matter concentrations exceeded WHO guidelines in central zones. The introduction of these schemes reduced traffic volumes in restricted areas and shifted drivers toward cleaner vehicles.

Low emission zones remain controversial when proposed in new cities. Opponents cite costs to drivers and businesses. However, health data increasingly supports their implementation. Survey results from central London residents indicate acceptance of ULEZ following its introduction, though initial resistance was substantial.

The Imperial College findings suggest that air quality improvements translate directly into fewer hospital emergencies. Respiratory infections, asthma exacerbations, and heart attacks all show associations with short-term pollution spikes. Sustained reductions in emissions therefore reduce the disease burden on the NHS and improve population health