Choking haze from forest fires has forced the indefinite closure of schools and offices in an Indonesian city on Borneo island, an official said last week. Hidayat, a meteorology official in the Central Kalimantan capital, Palangkaraya, said conditions were horrible in the city, where visibility had dropped to 10 metres (11 yards) since Thursday. A domestic Indonesian carrier, Merpati Nusantara Airlines, said the poor conditions had forced it to postpone all flights to Palangkaraya until the end of September.