1 From the Department of Anaesthesiology and Intensive Care Medicine; University Hospital Bonn (MC), Institute of Geosciences, Section Meteorology, University Bonn, Bonn, Germany (AH), Department of Meteorology, University of Reading, Reading, UK (KPS), Department of Anaesthesiology, University Hospitals Leuven (SR), Department of Cardiovascular Sciences, KU Leuven, Leuven (SR), Department of Electronics and Information System, IBiTech, Ghent University, Gent (AFK), Department of Anesthesia, Intensive Care and Pain Medicine, General Hospital Maria Middelares, Ghent, Belgium (AFK) and Institute of Climate and Energy Systems (ICE-4: Stratosphere), Forschungszentrum Jülich, Jülich, Germany (JCL).