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SINGAPORE – What you see is not what you get, at least when it comes to the haze, as poor visibility could be due to water vapour instead of haze particles.
On Monday (Sept 23) and Tuesday, some hazy conditions were observed even though air quality measures did not suggest the haze had suddenly worsened.
While people might be tempted to gauge air quality on how clear the air seems, it is actually not reliable, a researcher pointed out on Tuesday.
The National Environment Agency (NEA) also clarified as much last week and, again, on Monday.
Air pollution researcher Erik Velasco told The Straits Times: “Do not just trust your visual perception as hazy skies can also be triggered by mist. The one-hour PM2.5 readings are a better indicator of the actual air quality.”
Dr Velasco added that for specific haze events such as those caused by wildfires on neighbouring islands, PM2.5 readings could even be better than the 24-hour Pollutant Standards Index (PSI), which reflects air quality during the previous 24 hours.
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