SINGAPORE: Haze conditions in Singapore deteriorated on Tuesday (Sep 22), said the National Environment Agency (NEA). This was caused by the haze from Sumatra being blown in by the prevailing south-southeasterly winds. The agency added that the conditions would persist for the rest of the day.
As of 6pm, the 3-hour PSI was 155, while the 24-hour PSI was 86-108, in the Moderate to Unhealthy range. This was an increase from the corresponding readings of 111 and 78-85 at 2pm the same day.
"There has been an increase in the extent of moderate to dense haze over southern and central Sumatra," said NEA in its statement. "For tomorrow, the prevailing winds are forecast to blow from the south-southeast or south-southwest. Hazy conditions can still be expected."
NEA also said that the 24-hour PSI for the next 24 hours is expected to be in the low to mid sections of the Unhealthy range, and may enter the high end of the Unhealthy range if denser haze from Sumatra is blown in.
"Given the air quality forecast for the next 24 hours, healthy persons should reduce prolonged or strenuous outdoor physical exertion," NEA said, adding that such activities should be minimised by the elderly, pregnant women and children, and avoided altogether by those with chronic lung or heart disease.
An NEA update issued at about 7pm on Tuesday revealed 18 hotspots were detected in Sumatra - a low count due to cloud cover over parts of the island.