Air pollution from fuel combustion is one of the greatest environmental problems, especially in urban environments. In densely populated cities, the presence of nitrogen oxides, very small carbon particles, and carbon monoxide (CO) in the air seriously harms the human health and increases mortality. A collaboration between researchers from the University of Barcelona and from the Boreskov Institute of Catalysis of the Russian Academy of Sciences in Novosibirsk (Russia) opens the way for reducing emissions of automotive pollutants. In a recent study, the scientists present design principles and catalyst syntheses to transform toxic molecules in the air at temperatures below 0 degrees C.