Tourists visit a sightseeing spot as the Marina Bay Sands Hotel in the background is shrouded with haze in Singapore on Saturday, June 22, 2013. The blazes in peat swamp forests on Indonesia's Sumatra island have sent massive plumes of smog across the sea to neighboring Singapore and Malaysia, both of which have grown impatient with Indonesia's response to the perennial problem. Singapore is suffering its worst haze in history. [Photo/icpress.cn]

Singapore City, Marina Bay Hotel. [Photo/icpress.cn]