Hong Kong has leapt up the rankings of the world's most expensive cities for expatriates to live in. This has been caused by strengthening of the US dollar resulting from exchange-rate fluctuations, resources data and services provider ECA International says. The city was ranked No85 in the world in September last year but rose to 33rd place last month, the survey found. This year, Hong Kong is sandwiched between Beijing in 31st place and Shanghai, ranked 35th - the first time Beijing has topped Hong Kong. The Angolan capital Luanda remained in top spot, followed by four Japanese cities - Tokyo, Yokohama, Nagoya and Kobe. In Asia, the top 10 cities were Hong Kong and in Japan, the mainland and Taiwan. ECA's general manager for Asia, Lee Quane, blamed the rebound of the US dollar for raising costs for expatriates in cities where the currency was tied to the greenback. 'Earlier this year, we reported falling costs of living in Hong Kong as the currency depreciated. Now we see this trend is reversed. In the past two months, goods and services in Hong Kong have swung from being 10 per cent cheaper than in London to being almost 10 per cent more expensive,' Mr Quane said. 'The impact of this reversal is threatening to put the brakes on the economy by making the city more expensive for visitors and raising the cost of business for overseas firms.'