Term: Düsseldorf, Description: Place in North Rhine-Westphalia, Germany, Question: Does Düsseldorf have only a small number of smoggy days each year?, Answer:Yes
Fact1: Mercer's 2012 Quality of Living survey ranked Düsseldorf the sixth most livable city in the world. Fact2: Clean air is an important attribute for a livable city. Fact3: Smog is a term for air pollution. 