Air quality gradually deteriorated on Friday, when the western and central regions were the first to enter the unhealthy range.
NEA said on Friday that smoke haze from Sumatra had been observed drifting towards Singapore, while smoke haze was also detected over Kalimantan.
Dry conditions had persisted over Singapore, contributing to the deterioration in air quality.
On Saturday, showers are forecast over Singapore and the surrounding region, although smoke haze could continue to be transported from Sumatra under prevailing south-southeasterly or south-southwesterly winds.
Conditions could improve from Sunday, when winds are expected to shift to blow from the southwest or west, potentially reducing the amount of smoke haze transported towards Singapore.
Showers over Singapore and nearby areas could also help ease the situation.
However, the broader regional haze situation remains a concern.
According to the regional weather and haze assessment published on Friday, scattered hotspots were detected in southern Sumatra and Kalimantan, while moderate to dense transboundary smoke haze was observed over Singapore and parts of the surrounding region.
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