Singapore's pollution index climbed back to "hazardous" levels and air quality deteriorated in the Malaysian capital on Saturday as Indonesia came under heavy pressure to bring fires from slash-and-burn land clearing under control.
Indonesia has deployed military planes to fight the blazes on Sumatra island from illegal burning that typically takes place in the June to September dry season to clear space for palm oil plantations. The fires are unusually widespread this year and the smog is the heaviest in Singapore's history.
Companies behind the fires would find no refuge in Singapore, Foreign Affairs Minister K. Shanmugam said on Saturday, even as he acknowledged limits in international law to deal with firms that operate outside the city-state.
"We will do everything we can," he told a news conference.