Question: Does Düsseldorf have only a small number of smoggy days each year?, Answer:Yes, Description of Düsseldorf: Place in North Rhine-Westphalia, Germany, 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.
Step1: What is another term for smog?, Step2: What is Düsseldorf ranked as in Mercer's 2012 Quality of Living survey?, Step3: To be #2, does a country need to have limited #1 days a year?, Wikipedia page for step 1: Smog, Wikipedia page for step 2: Mercer's 2012 Quality of Living survey, Wikipedia page for step 3: Mercer's 2012 Quality of Living survey, not_definitive_answer: False, incorrect_answer: False