March was primarily due to unusual atmospheric conditions. Read more at straitstimes.com. Read more at straitstimes.com.
The difference is that Singaporeans use the term “Pollutant Standards Index” to measure the concentration of particulate matters in the air for a period of three hours.
SINGAPORE: Haze tinged Singapore’s skies on Wednesday (March 26) morning, with the Pollutant Standards Index (PSI) – a measure of air quality here – registering moderate levels at 9am.
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