A new study from Imperial College London's environmental research group has indicated that the predicted number of deaths linked to toxic air in the capital fell by about 40% in five years.

Nitrogen Dioxide (NO2) levels, a traffic-related gaseous pollutant that exacerbates asthma, impedes lung development, and raises the risk of lung cancer, are down 41 per cent.

Fine particulate pollution (PM2.5) level, extremely small particles that can result in serious health impacts especially in vulnerable groups of people such as the young, elderly, and those with respiratory problems, are down 28 per cent.

While the report, commissioned by the Greater London Authority (GLA) and Transport for London (TfL), does not isolate the impact of ULEZ or any other single policy, the Mayor of London, Sadiq Khan, has hailed the success of London’s efforts to reduce air pollution and improve health across the capital.

He said: “The evidence is now overwhelming and unarguable: the bold action we have taken in London has reduced pollution, improved public health and saved lives. From childhood asthma to dementia, we know that a wide range of illnesses are linked to air pollution. This latest data shows why expanding ULEZ London-wide was even more important than we previously thought and is transforming lives right across our capital. "

Dr Sarah Elkin, Consultant in Respiratory Medicine Imperial College Healthcare NHS Trust and Co- Clinical Director London Respiratory Clinical Network said: 

“London’s air is getting cleaner and it’s saving lives – as a respiratory consultant looking after Londoners who struggle with these conditions every day, I know just how important it is that we continue to push forward with the incredible progress we’ve already made. I am delighted to see the findings of today’s report which show that London’s bold actions to improve air quality have led to cleaner air – which we know is vital for Londoners’ health and wellbeing. The new evidence also underlines the strong links between exposure to air pollution and poor health, so it's fantastic to see this new research showing the estimated reduction in early deaths.”

Karen Bonner, Chief Nurse for the NHS in London, said: 

“These findings are a reminder of what is at stake when we talk about air quality. Thousands of Londoners are now living longer, healthier lives because the air they breathe is cleaner. Children with asthma, elderly residents, and those with respiratory conditions are among those who benefit most. There is still more to do, but this data shows that sustained, evidence-led action to tackle air pollution saves lives and we are committed to continuing to work alongside the Mayor and our partners to protect the health of every Londoner.”