1. Department of Chemistry University of York York UK
2. Energy and Resources Group University of California Berkeley California USA
3. National Centre for Atmospheric Science, Department of Meteorology University of Reading Reading UK
4. Department of Environmental Science and Policy George Mason University Fairfax Virginia USA
5. Department of Meteorology and Earth and Environmental Systems Institute Pennsylvania State University University Park Pennsylvania USA
6. Department of Earth and Environmental Sciences, Large Lakes Observatory University of Minnesota, Duluth Duluth Minnesota USA
7. Institute for Atmospheric and Climate Science ETH Zurich Zurich Switzerland
8. Department of Geography University of Ottawa Ottawa Ontario Canada