The haze returned to Singapore due to smoke haze from Sumatra, with the 3-hour PSI in the unhealthy range - at 110 at 1pm.

SINGAPORE: The haze returned on Sunday (Oct 19), likely due to smoke haze from Sumatra.

The three-hour Pollutant Standards Index (PSI) crossed over to the unhealthy range at 11am - with a reading of 104. It climbed to 106 at 12pm, and 110 at 1pm.

The National Environment Agency (NEA) expects the haze to stay for the rest of Sunday, with the overall 24 hour PSI likely to hover in the high end of the moderate range and the low end of the unhealthy range.

It said conditions may improve, as thundery showers are expected in the afternoon.