Haze in Singapore: PSI back to ‘unhealthy’ range, PM2.5 remains ‘elevated’ in all regions

PM2.5 scores from 0 to 55 represent normal values, those between 56 and 150 indicate an elevated concentration of fine particles, while readings between 151 and 250 are considered high and scores above 251 are classified as very high.

The highest PM2.5 reading this haze season was recorded at 3pm on Oct 14 in the western part of the island at 288.

Singapore is in its 13th consecutive day of unhealthy air since Oct 5 – the longest continuous stretch of poor air quality the country has endured since the 2015 haze crisis. That year, bad air lasted 14 days from Sept 23 to Oct 7.

In its daily haze advisory on the evening of Oct 16, the National Environment Agency (NEA) said the PSI forecast for Oct 17 could be between 150 and 230, putting it in the range of “unhealthy” to “very unhealthy”.

Some showers are expected over Singapore and the surrounding region, including over parts of Kalimantan, on Oct 17.

“With the winds forecast to shift to blow from the south-east or south-south-east, the transport of smoke haze from Kalimantan to Singapore may be reduced. However, some smoke haze from Sumatra may drift towards Singapore,” the agency said.

Similarly, showers are also forecast over Singapore and parts of Kalimantan on Oct 18 and 19, it added.

It said that the winds are expected to gradually weaken and blow from the south-east or south, which could further decrease the movement of smoke haze from Kalimantan to Singapore.