Transborder haze is a perennial problem in Southeast Asia as regulatory loopholes make it hard for authorities to eliminate Indonesia's slash-and-burn land clearing practices.
Singapore's National Environment Agency said 212 hot spots were detected on Indonesia's nearby Sumatra island on Friday, up from 65 on Thursday and 15 the day before.
A brief shift in the wind direction on Friday afternoon blew some of the lighter haze toward Singapore, worsening the island nation's in air quality, it said.
Earlier in the week Malaysia urged Indonesia to take action on the fires within Indonesia's borders as the air quality in Malaysia hit unhealthy levels.
The most severe haze conditions recorded in Singapore were in September 2015, when the 24-hour index exceeded 300 to the hazardous level, prompting school closures.
Persons:
Antara, Chen Lin, William Mallard
Organizations:
Rights, National Environment Agency, Thomson
Locations:
Ogan Ilir, South Sumatra, Indonesia, Rights SINGAPORE, Singapore, Southeast Asia, Sumatra, Malaysia, Indonesia's