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Haze worsens as 24-hour PSI enters very unhealthy range on Tuesday
[SINGAPORE] Hazy conditions in Singapore took a slight turn for the worse early Tuesday (Sept 29) morning, with air quality reaching very unhealthy levels.
The 24-hour Pollutant Standards Index (PSI) entered the very unhealthy band of 142-203 at 4am, and has crept upwards since.
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