Vienna is the best city in the world to live while war-torn Baghdad is the worst, a survey said Wednesday, putting Europe at the top of the rankings with Asia and Africa trailing.

全球城市生活质量调查本周三出炉，维也纳高居榜首，饱受战争之苦的巴格达排名垫底。欧洲城市在榜单中名列前茅，亚非城市排名靠后。

Vienna offers some of Europe's best opera, dance and theatre.

The Austrian capital "retains（保持，记住） the top spot as the city with the world's best quality of living," British consultancy（咨询公司） firm Mercer said in its 2010 Quality of Living Survey.

Swiss cities Zurich and Geneva followed in second and third places respectively¹（分别地，各自地） , while Vancouver in Canada and Auckland in New Zealand were joint² fourth.

For its annual survey, Mercer assessed³（评估） the quality of living in 221 cities worldwide, measuring them against New York with an index⁴ score of 100 points as the base city.

Vienna, which also took the number one spot last year, scored a total 108.6 points, while Baghdad scored the lowest with just 14.7 points.

European cities continued to dominate⁵ the top 25 cities in the survey, Mercer said, while Canadian cities also had a strong showing.

Among cities in Britain, London ranked number 39, Birmingham 55 and Glasgow 57.

In the United States, the highest ranking entry was Honolulu in 31st place, followed by San Francisco in 32nd.

Singapore was the top-scoring Asian city in 28th place, followed by Tokyo in 40th.

Baghdad ranked 221st, remaining at the bottom of the list. It was followed by Bangui（班基） in the Central African Republic, N'Djamena in Chad, Khartoum（喀土穆） in Sudan and Tbilisi（第比利斯） in Georgia.

Mercer also awarded cities eco rankings based on water availability and drinkability, waste removal⁶, quality of sewage systems（污水下水道系统） , air pollution and traffic congestion⁷（交通拥挤） .

Calgary in Canada came top of this list, followed by Honolulu in second place and Ottawa and Helsinki in joint third place.

Port-au-Prince in Haiti ranked at the bottom of this table, Mercer said.