- Which processes dominate the exchange between atmosphere and the Earth's surface?
- Which conditions enhance the impact of emissions or uptake, chemical reaction or dynamics?
- How are these processes controlled or perturbed by weather, environment and climate?
- How do the emissions of great ecosystems impact air quality and climate?
- Which reaction mechanisms are important for particle formation and growth?
- Which conditions lead to an accumulation of toxic gases in the atmosphere?
- How do atmospheric reactions change, when natural emissions mix with anthropogenically released compounds?
- How can uncertainties in measurements and model be reduced in order to improve predictions?