QBio Symposium 2025
“The Air We Breathe”
In this yearly symposium, part of the Quantitative Biology (QBio) Honours Programme, we explore a subject from the point of view of multiple research disciplines. In particular, there is an emphasis on life sciences & natural sciences.
This year, we’ll explore something we rarely stop to think about, but all depend on: the air we breathe! We’ll discuss everything from its modeling, its role in the spread of disease, and even the part it plays in climate change.
Registrations are open!

| Schedule | |
|---|---|
| 10:30 | Room open |
| 10:50 | Introduction |
| 11:00 | The One Health Dynamics of Airborne Pathogens: linking Humans, Animals and the Environment – Dr. Myrna de Rooij |
| Abstract:
“Airborne zoonotic transmission is an increasingly recognised One Health challenge, linking animal, environmental, and human health through ‘the air we all breathe’. This presentation will introduce key mechanisms by which pathogens can spread from animals to humans through the environment. We will dive into real-world examples, including outbreaks where airborne transmission played a critical role. Attention will be given to how human behaviour, agricultural systems, and surrounding environmental conditions modulate the risk of transmission. The session will illustrate how integrated One Health approaches can reduce the risk and impact of airborne zoonoses.” |
|
| 11:45 | Second presentation |
| 12:30 | Lunch |
| 13:15 | Healthy soil = healthy ecosystem? – Dr. Emilia Hannula |
| Abstract:
“Soils are the basis of many ecosystem functions such as carbon and nutrient cycling, water purification, and food production. However, they are often seen only as ‘dirt’ and ignored by people and policy makers. In this talk I will discuss the ways soils are linked to human health (through air quality and food) and how they as largest terrestrial carbon sinks, regulate carbon cycling, and in this way affect climate. I will further highlight the need of interdisciplinary connections to solve big societal issues and talk about our ongoing interdisciplinary projects to link soils to gut health and policy (Soils2Guts) and to understand and steer soil carbon storage across Dutch land uses.” |
|
| 14:00 | Montreal Protocol: Ozone layer protection and climate change – Prof. dr. Guus Velders |
| Abstract:
“I never hear about the ozone hole anymore, isn’t it solved? This is a question I hear often. In my presentation I will explain what causes depletion of the ozone layer, how the Montreal Protocol was designed, what the world would have looked like without the protocol, what the current status of the ozone hole is and how protection of the ozone layer is also helping to fight climate change. I will discuss how various groups of people, policymakers, scientist, industry and consumers, played a role in this.” |
|
| 14:45 | Break (Coffee/Tea) |
| 15:15 | Fifth presentation |
| 16:00 | Sixth presentation |
| 16:45 | Closing |
| Dr. Myrna de Rooij | Utrecht University |
| Dr. Myrna de Rooij is an Assistant Professor at Utrecht University’s Institute for Risk Assessment Sciences. She has a background in Exposure Science, Veterinary Medicine, and Epidemiology. She currently studies environmental, human, and animal health. | |
| Dr. ir. Janna Barel | Utrecht University |
| Dr. Janna Barel is an Assistant Professor researching the interactions of plants and soil. | |
| Dr. Emilia Hannula | Leiden University |
| Dr. Emilia Hannula is an Associate Professor at Leiden University where she studies soil fungi and soil ecology. She is leading the soil ecology group at Leiden University, and is also leading a consortium which connects human microbiomes to soil microbiomes. | |
| Prof. dr. Guus Velders | Utrecht University |
| Dr. Guus Melders is a Professor at Utrecht University where he teaches on air quality and climate interactions. He is also a senior scientist at RIVM, where he does ozone layer and air quality modeling. In 2016, he contributed valuable research to the Montreal Protocol. | |