His website displays one-hour and three-hour PSI estimates, calculated from PM2.5 concentrations, alongside NEA‘s official 24-hour PSI readings.
It also breaks down air pollution levels across Singapore’s north, south, east, west and central regions.
However, Zi Heng makes it clear that his one-hour and three-hour PSI figures are his own calculations, not official NEA readings.
“I have listed quite a lot of warnings near all my readings! The last thing I would want is to mislead anyone,” he said.
The website also draws data directly from NEA’s API.
According to Zi Heng, the data generally updates within one to two minutes of the start of each hour, while he has observed that NEA’s public haze website sometimes takes around 10 minutes to update.
Zi Heng also stresses that the measurements should not be taken as medical advice.
“It shouldn’t be used as a scientific measure or for advice, but it can hopefully help convince vulnerable people to stay home during the haze, just like they would avoid a smoking corner,” he explained.
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