No. 1: Vienna, Austria

Mercer Quality of Life (QoL) Index: 108.6*
Change in QoL Rank from 2009: None
Eco-City Ranking: 44 (tie)
Country GDP, 2009: $382 billion**
Population: 1.66 million (city); 8.33 million (country)
Country Life Expectancy: 79.5

* The rankings are based on a point-scoring index derived from 39 factors and weighed relative to New York, which is given a score of 100. Vienna's index score was 108.6 and Baghdad's was 14.7. The top 10 cities on the list were separated by a difference of only 2.3 points. The quality-of-living survey encompasses 420 cities, of which results are published for 221. The study is intended to help governments and corporations place employees on international assignments, not as a basis for tourism or foreign investment.

** Source: International Monetary Fund. Gross domestic product is denominated in U.S. dollars at current prices.