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 will be collecting pieces of plane‑tree bark for laboratory analysis until the end of April 2026. Would you like to take part? Read below to find out how to get started!
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 Dr Ir Roeland Samson
Hoe does it work?
Step 1: Collect the plane tree bark
The plane tree is known for its flaking bark. Do you see a plane tree in your neighbourhood with peeling bark? Collect clean pieces of bark from the street-facing side, avoiding moss, graffiti, nails, or any other damage. Take loose bark fragments from a single tree trunk at a height between 1 and 1.7 metres. Try not to touch the bark with your fingers. Use a plastic bag turned inside out to collect your sample. Do not pick up fallen pieces of bark from the ground.
Step 2: Generate a collect via PartiCollect
Generate a code via the PartiCollect app (available in the Google Play Store or App Store).
Select 'New measurement' → 'Air' → 'Bark sample'.
Write this code on the envelope before sending your sample.
To help with the sample registration, you'll have to answer 5 brief questions.
Step 3: Submit/send your sample.
Place the collected bark in a sturdy envelope. Write the code you created with the Particollect app, along with the street name and municipality of the tree from which you collected the bark, on the envelope. This allows us to determine the area from which the material originated. After sealing the envelope, you can drop it off at a collection point until 30 April or send it directly to the central address.
Would you like to receive the results of the research? Please fill in the form at the bottom of this page. Thank you for your participation!
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.
