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Clearing the air in the Big Smoke - a complex challenge with a long history

“A great chocolate-coloured pall lowered over heaven...” – Robert Louis Stevenson, The Strange Case of Dr Jekyll and Mr Hyde

London is once again in the grip of another air quality crisis, although not one as dramatic as the Victorian killer fogs that used to blight our city. The 21st century problem is rather subtler, caused by invisible pollutants such as nitrogen dioxide (NO2) and microscopic particulate matter (PM). These are associated with a range of respiratory and cardiovascular diseases, and are especially problematic for people with lung conditions such as asthma and COPD, as well as the elderly and small children. It has been estimated that over 9,400 deaths in London can be attributed to these pollutants every year, with the major source being road transport (in particular diesel engines), though gas combustion and wood burning also play a role. 

The Challenge Prize Centre at Nesta is convening experts and stakeholders to put their heads together to identify innovation challenges in cleaning up London's air pollution.

Rippers and pea soupers

London has historically been a world leader in air pollution. Bad air has blighted the capital ever since burning coal became commonplace in the 12th century, resulting in Edward I (ineffectually) banning the fossil fuel in 1306. Things went from bad to worse after the industrial revolution, and in the 19th century the city was notorious for the choking ‘London fog’, ‘London particular’ or ‘pea soupers’. A recurrent trope of Victorian literature, it provided atmosphere and symbolic weight in classics such as Bleak House, The Strange Case of Dr Jekyll and Mr Hyde, and Alfred Hitchcock’s Jack the Ripper-inspired 1927 silent film The Lodger – a Story of the London Fog.

Things came to a head in December 1952 when weather patterns trapped a thick cloud of smog in the city for several days in an event dubbed 'The Great Smog of 1952', directly causing around 4,000 deaths. This led to the Clean Air Act of 1956, which created ‘smoke free zones’ where only smokeless fuel could be burned. The journey to cleaning London’s air had begun.

London fog today

There is no level of PM that is not associated with negative health effects, and London’s air contains above WHO-recommended levels, although it is within EU legal limits for now. When it comes to NO2, however, it is far in excess of both. The London Air Quality Network, run by the Environmental Research Group at King’s College London, found that in 2014 39 out of 67 monitoring sites were in breach of EU annual legal limits for NO2, with eight of these over twice the limit. The extent of the problem hit the headlines in January of this year, when it was reported that in Lambeth the yearly legal limits for the number of times hourly NO2 levels can go above 200µg/m³ was exceeded in just five days.

What we're doing about it and how you can help

The Mayor of London has an Air Quality Strategy to address this crisis. This features many important initiatives such as the creation of an Ultra Low Emission Zone in central London, cleaning up the public transport fleet and providing a dedicated £20m fund for air quality projects at the local level. However, there remains a pressing need to accelerate this plan further, and we believe a challenge prize could be a very productive mechanism for doing so.

Cleaning London’s air is complex, possibly even a wicked problem. The complexity arises from the difficulty in defining the problem (pollutants and sources vary with time and place); that there is no single solution but multiple, diverse, hard to compare potential solutions; and because there is a large number of varied actors involved. Tackling the issue requires a mix of social, infrastructural and technological innovation. Helping break down complex problems like this into a series of discrete challenges and encouraging innovators to address these is the core work the Challenge Prize Centre at Nesta was set up to do.

We'll be holding an expert/stakeholder workshop on London's air quality challenges at Nesta HQ on 15 March 2017

This event, Make London Breathe Again: Accelerating Clean Air in the Capital, is the latest installment of the quarterly Challenges of Our Era Forum series, following on from last October's Forum on protein recycling. The aim of this event is to convene people with a broad range of perspectives and expertise to identify key challenges in accelerating the cleaning of London’s air, and where a challenge prize might help focus innovation to tackle them.

The air quality problem in London is just one example of a global urban public health emergency, one of the most significant challenges of our era urgently requiring innovation and public engagement. 

If you would like to register your interest, please get in touch at [email protected].


Richard Duffy

Richard Duffy

Richard Duffy

Foresight Researcher

Richard was responsible for monitoring new developments and trends in science and technology for the Challenge Prize Centre.

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