The plane tree as a natural logbook for air pollution
Planetreecheck measuring campaign 2026
With the plane‑tree check, you can measure particulate‑matter emissions in your area. We have collected pieces of plane‑tree bark for laboratory analysis until May 4th, 2026. Did you not yet send in your samples? You can still post them to us or bring them to a collection point until May 15th.
Would you like to take part (again) next year? We are planning a new sampling campaign in April 2027. Enter your e-mail address at the bottom of this page to stay informed.
What will happen now?
More than 420 bark samples have been registered in the PartiCollect app in Belgium. Thank you to all who contributed! During the summer months, these samples will be analysed in the laboratory at the University of Antwerp. The results will be published here in the autumn. Would you like to be notified when the results are published? Enter your e-mail address at the bottom of this page.
Why is airborne particulate matter harmful?
Fine particulate matter is a collective term for all airborne particles smaller than ten micrometres that can enter your body. It is an important focus of research into air pollution; fine particulate matter is a leading cause of environment‑related illness in Europe. Each year, thousands of people die prematurely as a result of excessive amounts of fine particulate matter. These particles can enter the bloodstream via the lungs, which can worsen a range of health complaints such as shortness of breath, asthma, and increased heart rate. Long‑term exposure increases the risk of stroke, heart attack, and premature birth during pregnancy. In addition, fine particulate matter is a risk factor for several chronic conditions such as bronchitis, lung cancer, Alzheimer's disease, Parkinson's disease, and type 2 diabetes (Scienscano).
Although the standards of the European Union (EU‑AQS) and the World Health Organization (WHO‑AQG) have been exceeded in Belgium for many years, attention to fine‑particulate pollution in our surroundings is still limited. By taking part in this research, you can help take the first concrete steps towards a society with clean and healthy air for everyone. Are you interested? Then be sure to read the 'How does it work?' section below.
How do we measure particulate matter concentrations using plane trees?
Measuring means knowing! Plane trees provide a wealth of information about the amount of fine particulate matter in their surroundings through their bark. During the winter, they store this fine dust in their outer bark. When they begin to shed in spring, the bark layers containing the stored fine particulate matter end up on the outside of the trunk. By collecting and analysing pieces of peeling bark from plane trees spread throughout the area, we can map the levels of fine particulate matter in our living environment. In this way, we measure how much fine particulate matter was present in your neighbourhood. All samples are analysed by the University of Antwerp under the supervision of prof. Roeland Samson
FAQ'S
Why do you collect plane tree bark?
The plane tree (genus: Platanus) captures fine particulate matter from the air in its bark. By analysing these particles, we gain a better understanding of air quality in different neighbourhoods.
Can I remove bark from the plane tree?
Yes, but only loose pieces may be removed. Do not pull off firmly attached fragments to avoid damaging the tree. Choose pieces of bark that are already slightly detached and not contaminated or damaged by moss, graffiti, or nails.
Can I collect fallen plane tree bark?
No. Bark that has fallen to the ground may contain dirt that could interfere with the analysis. Only collect loose pieces of bark directly from the tree.
How much plane tree bark do I have to collect?
A handful is sufficient. You don't need to bring large quantities.
Where can I deposit my plane tree bark samples?
You can drop off your samples at one of the collection points or send them to the central collection address at the University of Antwerp. You can find all practical information on our website on the 'collection points' page.
What happens to the collected bark samples?
We analyse the material for fine particulate matter and publish the results afterwards, so that everyone can gain insight into the air quality in their own surroundings.
When could we expect the research results?
The analysis of all collected bark samples will be completed later this autumn. If you would like to stay informed, you can register your email address at the bottom of this page.
