Haze update for Sept 11: 24-hour PSI expected to be in moderate to low unhealthy range

Moderate to heavy thundery showers over several areas of Singapore on Friday (Sept 11) afternoon brought some respite from the haze and heat. 

As at 6pm, 24-hour Pollutant Standard Index (PSI) readings across all five regions on Singapore are in the moderate range.

Meanwhile, 1-hour PM2.5 readings are also in the normal range. 

But the National Environment Agency (NEA) expects the Republic's 24-hour PSI to be in the moderate to low unhealthy range.

NEA said in its daily haze situation update on Friday evening that moderate to dense smoke plumes have continued to be observed from fires in southern Sumatra and Kalimantan.

It noted that showers could be expected over northern and central Sumatra over the coming days, but that dry conditions are forecast over Kalimantan and southern Sumatra.

This, coupled with the prevailing southerly or south-easterly winds means there remains a risk of transboundary smoke haze affecting Singapore, should fires in Indonesia persist. 

Members of the public are reminded that the health impact of haze is dependent on one's health status, the PSI level, and the length and intensity of outdoor activity. 

Those who are planning to conduct or participate in outdoor activities immediately can check the 1-hour PM2.5 concentration readings and vulnerable persons guide.

Meanwhile, those who are planning outdoor activities for the next day should use the 24-hour PSI forecast and the corresponding health advisories for planning.

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