On Friday night, the one-hour PM2.5 in the central and eastern parts of Singapore were at elevated levels, meaning PM2.5 concentrations were above 55 micrograms per cubic m of air.
PM2.5 refers to fine particles – usually airborne – that are 2.5 microns or smaller and can be lodged deep in the lungs, posing severe health risks.
The PSI is computed based on a 24-hour average of concentration levels of PM2.5, among other pollutants.
With the air quality worsening, some in Singapore find their plans thwarted.
HomeTeamNS, in a Facebook post on Saturday morning, said that their annual Real Run 23 will have to be modified following the elevated haze situation.
It added that its 10-km competitive race will be converted to a non-competitive run. Their other two race categories – the 5-km non-competitive run and the 2.4-km fun walk will remain.
“The safety of participants is our utmost priority, and we apologise for the inconvenience,” it said.
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