Created 24 years after his iconic Save Our Water poster, Erni produced this design to draw attention to the dangers of air pollution in Switzerland. It was issued in the country’s four official languages as well as in English in order to encourage broad distribution. The lower left corner indicates in both German and French that viewers could send in 20 francs for a copy of the poster or 10 francs for a miniature version or set of postcards. Between 1981 and 1993, Switzerland made substantial efforts to reduce the emission of sulfur dioxide, created through the burning of fossil fuels and mineral extraction. Today, 70 percent of Swiss electricity is produced by hydropower and other renewable sources.