2014 Cover of Nature Geoscience

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Collaborative work between Geiger and Salvo on the cover of Nature Geoscience.
In this article, the authors describe results from a detailed analysis of measured air pollutants showing that ozone concentrations rose, and nitric oxide and CO concentrations fell, when motorists in the subtropical megacity of Sao Paulo, Brazil, used predominantly ethanol as opposed to gasoline.
Reduction in local ozone levels in urban São Paulo due to a shift from ethanol to gasoline use
Alberto Salvo & Franz M. Geiger
Nature Geoscience 7, 450–458