Artist Martin Nothhelfer rides as the Cloud Cyclist (Wolken Radler) on his smoke blowing bicyle at the Geschwister-Scholl-Platz in Munich, Bavaria, Germany, 28 July 2018. Nothhelfer wants to show with his performance where there is good and bad air in Munich. In addition, his bicycle blows out soap bubbles when the air is clean, but in bad air it smokes. (Photo by Lukas Barth-Tuttas/EPA/EFE)
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