It is hard to discuss air pollution with citizens because it is invisible.
Across Europe, where air pollution claims some 800,000 lives each year, a quiet experiment unfolded in six cities: rather than imposing solutions from above, researchers from University College Dublin invited residents, schoolchildren, and local officials to co-design their own remedies. The iSCAPE project, funded by the European Commission and concluded in 2020, demonstrated that something as ancient as a hedgerow — positioned with care — could cut exposure to harmful particulate matter by half. What emerged was not merely a set of environmental findings, but a model for how democratic participation and natural infrastructure might together address the invisible crises of modern urban life.
- Air pollution kills roughly 800,000 Europeans each year, yet it remains invisible to the senses — a crisis that is simultaneously urgent and easy to ignore.
- Past top-down interventions had repeatedly failed to take hold, leaving cities trapped in cycles of policy without buy-in or lasting behavioral change.
- The iSCAPE project broke the pattern by treating citizens, schools, and community groups as co-designers rather than recipients, using low-cost monitoring kits to make the invisible tangible and personal.
- The science delivered a striking result: correctly placed hedges mixed with trees can reduce particulate matter exposure by up to 50%, while photocatalytic surface coatings showed enough promise to attract port-scale deployment planning in Barcelona.
- London has already embedded the project's guidelines into official city standards, Dublin is following, and an open-access toolkit now exists for any city or community ready to act.
Across the European Union, air pollution quietly kills around 800,000 people each year — most of them urban residents breathing air they cannot see or measure. For years, the European Commission watched this toll rise. Then it tried something different.
The result was iSCAPE, a three-year research project coordinated by University College Dublin and carried out across six volunteer cities: Bologna, Bottrop, Dublin, Guildford, Hasselt, and Vantaa. Rather than arriving with predetermined answers, the project used a Living Labs methodology — treating citizens, local officials, schools, and community groups as genuine partners in designing solutions. Coordinator Francesco Pilla was direct about why: previous efforts had failed because they were handed down. This time, the goal was co-design, awareness, and genuine public ownership of the measures adopted.
The work ran on two tracks. One was physical — planting hedgerows, installing green walls and roofs, applying photocatalytic coatings, and reshaping road geometry. The other was behavioral, encouraging people to change how they moved through cities and to monitor pollution themselves using low-cost sensor kits developed by the team. Those kits proved transformative: they gave residents tangible evidence that the interventions were working, and that evidence became leverage for policy change. The kits are now commercially available.
The findings were significant. Correctly positioned hedges mixed with trees reduced particulate matter exposure by as much as 50 percent — a result that reframed what cities long resigned to poor air quality might actually achieve. Photocatalytic coatings tested in Bologna impressed Barcelona's port authority enough to begin planning a broader European rollout.
Perhaps more remarkable than the science was the speed of its adoption. London incorporated the project's guidelines into official city standards. Dublin began the same process. In Dublin's primary schools, Lego co-design workshops brought children into the conversation, followed by a booklet explaining air pollution in terms they could grasp and act on.
The project left behind a fully open archive — sensors, data tools, green infrastructure guides — available to policymakers, communities, and activists alike. What began as an experiment in six cities now stands as a replicable template, and a quiet argument that asking residents first, rather than telling them what to do, may be the most powerful urban intervention of all.
Across the European Union, air pollution silently kills roughly 800,000 people each year. Most of us breathe it without thinking about it—especially those of us packed into cities, where the invisible poison hangs thickest. For years, the European Commission watched this toll mount, then decided to try something different: instead of imposing solutions from above, they would ask cities and their residents to build them together.
That experiment became the iSCAPE project, a three-year research effort funded by the EU and coordinated by University College Dublin. Six cities volunteered to be laboratories: Bologna, Bottrop, Dublin, Guildford, Hasselt, and Vantaa. The approach was deliberately humble. Rather than arriving with a predetermined fix, the researchers used what's called the Living Labs methodology—a framework that treats citizens, local officials, schools, and community groups as equal partners in the design process. Francesco Pilla, the project's coordinator, explained the reasoning plainly: past efforts had failed because they were handed down. "We wanted to co-design solutions with the general public," he said, "and use this opportunity to raise awareness and create buy-in for the measures adopted."
The work split into two tracks. One was physical: planting hedgerows mixed with trees, installing green walls and roofs, applying photocatalytic coatings to surfaces, reshaping road geometry, and creating green urban spaces. The other was behavioral—encouraging people to shift how they moved through cities and inviting them to monitor pollution themselves. This second part proved crucial. "It is hard to discuss air pollution with citizens because it is invisible," Pilla noted. So the team built low-cost monitoring kits and turned pollution tracking into a citizen science activity. The kits worked. They gave people tangible proof that the interventions were actually working, and that proof became a tool for pushing change into policy. The kits are now commercially available at low cost, a direct legacy of the project.
The results were striking. When positioned correctly, simple hedges mixed with trees could reduce exposure to particulate matter by as much as 50 percent. That single finding—that nature-based solutions could cut pollution exposure in half—reframed what was possible in cities that had long assumed they were stuck with their air quality. The photocatalytic coatings tested in Bologna showed enough promise that Barcelona's port authority began planning a wider deployment, with an eye toward rolling it out across Spanish and European ports.
What happened next was perhaps more important than the science itself. The findings moved into policy with unusual speed. London incorporated the project's guidelines into its official city standards. Dublin began the adoption process. In Dublin's primary schools, researchers ran Lego co-design workshops to teach children about pollution and make them feel like part of the solution. A children's booklet explaining air pollution followed. The initiative caught on and spread. This wasn't a top-down mandate; it was something people wanted to do.
The project left behind a public archive of materials—open-access documents on building your own sensors, analyzing data, and implementing green infrastructure. Policymakers, community groups, industry partners, and citizen activists can now access the full toolkit. What began as an experiment in six cities has become a template. The question now is whether other European cities will follow, and whether the model of asking residents first, rather than telling them what to do, might reshape how cities approach the invisible crisis that kills hundreds of thousands of people every year.
Citações Notáveis
We wanted to co-design solutions with the general public and a wide range of stakeholders and to use this opportunity to raise awareness and create buy-in for the measures adopted.— Francesco Pilla, Project Coordinator, University College Dublin
It is hard to discuss air pollution with citizens because it is invisible. So we developed low-cost monitoring kits and used them for citizen science activities, which was a very powerful way to demonstrate that our interventions were working.— Francesco Pilla
A Conversa do Hearth Outra perspectiva sobre a história
Why did the top-down approach fail so badly before?
Because people resist what they don't help design. If a city plants trees without asking residents why, or where, or what they need, the trees become something imposed rather than something owned. The iSCAPE teams learned that the moment you involve people in the solution, they become invested in it.
The 50 percent reduction—is that just for particulate matter, or does it apply to all pollutants?
The study focused on particulate matter, which is one of the most harmful components of urban air pollution. It's not a cure-all, but it's the thing that lodges in your lungs and causes the most direct health damage.
Why did the citizen science kits matter so much? Couldn't they just measure pollution with instruments?
Because invisible things are hard to believe in. When people build a sensor themselves and see the numbers drop after trees are planted, they're not reading a report—they're holding evidence. That's the difference between knowing something and believing it.
The London and Dublin adoptions happened quickly. Why?
Because the project didn't just show that green infrastructure works. It showed that it works when communities help design it. That's a policy win, not just an environmental one. Cities saw a model that actually gets people on board.
What happens to a city that doesn't adopt these solutions?
It keeps losing people to air pollution. The 800,000 deaths a year in the EU—that's not abstract. It's people who could have lived longer if the air they breathed was cleaner.