More than 450 different chemical substances are swirling around the air in Danish classrooms according to a new report from the large Mass Experiment on the indoor climate in Danish schools. Virtually all of the classes studied have concentrations above recommended levels.

Denmark's first test-scale plant to produce hydrogen by catalytic pyrolysis of biogas will be ready in three years. The technology can convert carbon - captured from the atmosphere via photosynthesis - into solid form and simultaneously produce hydrogen very energy-efficiently. A great match for Denmark’s leading role in the biogas area, says AU scientist behind the project.

The so-called forever chemicals, PFAS, are found in many places in nature, but remediation is problematic because their concentrations are extremely small. New research will make it easier and more efficient to remove these toxic substances.