Why is PSI trending in Singapore today?
The 24‑hour Pollutant Standards Index (PSI) is high because transboundary haze from forest fires in Indonesia has raised PM2.5 levels, pushing readings into the unhealthy band nationwide.
What happened
- 14 Oct, 14:00 UTC
Hourly PM2.5 in the west hit 284 (very high) and the 24‑hour PSI ranged from 110 to 153, marking unhealthy air across Singapore [1]
- Earlier this week
Indonesia’s forest fires, described by officials as “beyond human error,” have generated haze that is affecting Singapore and Malaysia [2]
- Earlier today
NEA warned that dry conditions will continue, keeping haze risk elevated and advising reduced outdoor activity [1]
What you need to know
Unhealthy PSI means outdoor activities should be limited, especially for vulnerable groups.
N95 masks will be distributed when PSI exceeds 200, per the Haze Task Force.
Schools may close if the next‑day forecast shows hazardous PSI (>300).
Community centres can serve as air‑conditioned shelters when PSI is very high.
Exact dates when PSI will cross the very unhealthy (200) or hazardous (300) thresholds are not confirmed, as they depend on evolving fire and weather conditions.
Background
Singapore’s air quality is measured by the 24‑hour PSI, which aggregates pollutants like PM2.5. Readings above 100 are classified as unhealthy, prompting health advisories.
The current haze originates from forest and land fires in Indonesia, which have been described by Indonesian officials as a natural phenomenon beyond human control. Regional winds carry the smoke into Singapore.
The National Environment Agency (NEA) has issued a haze advisory, noting dry weather across much of the southern ASEAN region and forecasting continued dry conditions that sustain the haze.
Questions people ask
What does an unhealthy PSI mean for daily life?
It signals that prolonged outdoor activity can affect health, especially for children, the elderly and those with respiratory conditions.
Will schools close because of the haze?
The Ministry of Education may close schools if the next‑day PSI forecast exceeds 300, the hazardous level.
How can residents protect themselves?
Stay indoors in air‑conditioned spaces, limit strenuous outdoor work, and use N95 masks if PSI rises above 200.
Where this came from
[1] channelnewsasia.com
PM2.5 readings high in 3 regions of Singapore as haze persists; air quality remains unhealthy across country
Preview image from channelnewsasia.com
[2] mothership.sg
Indonesian govt official says forest fires 'beyond human error' & their forests 'send oxygen' if there's no haze
Preview image from mothership.sg
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