Greenpeace activists climbed on top of the Golden Victoria monument to dress her in a gas mask and install a "Breathless through the city" banner, in a protest against air pollution in Berlin, Germany on Tuesday. /CFP Photo

Many German cities exceed the EU limit for nitrogen oxide levels, according to data published by the Umweltbundesamt (UBA), Germany’s main environmental protection agency founded in 1974. /CFP Photo

Greenpeace in London also took action earlier this year. Activists floated a picture of Mary Poppins wearing a gas mask in front of the Houses of Parliament, to highlight how London had breached its annual air pollution limit for 2017 in just five days. /CFP Photo