"Air pollution in Singapore rose to the "unhealthy" level on Friday as acrid smoke drifted over the island from fires on Indonesia's Sumatra island, the city-state's National Environment Agency (NEA) said, in a repeat of an annual crisis.

Every dry season, smoke from fires set to clear land for palm oil and pulp and paper plantations in Indonesia clouds the skies over much of the region, raising concern about public health and worrying tourist operators and airlines.

The 24-hour Pollution Standards Index (PSI), which the NEA uses as a benchmark, rose as high as 105 in the afternoon. A level above 100 is considered 'unhealthy'."

Marius Zaharia reports for Reuters August 26, 2016. [2]