Haze Day NEA 24-hour PSI (Singapore)
The Pollutant Standards Index: a 24-hour rolling index combining six pollutants. NEA uses it for health advice about the next day, rather than for deciding the next hour.
- Publisher
- National Environment Agency (NEA), Singapore
- What it measures
- PSI by region plus sub-indices for PM2.5, PM10, SO₂, O₃, CO and NO₂. Bands: Good 0–50, Moderate 51–100, Unhealthy 101–200, Very unhealthy 201–300, Hazardous above 300.
- Update frequency
- Hourly, but each value is a 24-hour rolling figure, so it changes slowly.
- Coverage
- Singapore only (five regions).
- How we use it
- Shown beside the 1-hour PM2.5 and used for NEA's 'planning tomorrow' guidance table.
- Limitations
- Because it averages 24 hours it lags real conditions. After a sharp improvement the PSI can stay 'unhealthy' for many hours.
- Terms
- Singapore Open Data Licence; attribute NEA / data.gov.sg.
- Official site
- https://www.haze.gov.sg/
- API / docs
- https://api-open.data.gov.sg/v2/real-time/api/psi
- Our JSON endpoint
- https://haze.day/api/now?place=sg
Live example
Reading time 2026-10-11 11:00 (Singapore time)
| North | South | East | West | Central | |
|---|---|---|---|---|---|
| PSI (24 h) | 117 | 114 | 135 | 150 | 149 |
Singapore now · loading the official reading…
Used on these pages
- Will youth training or matches be cancelled because of haze?
- Should I check the 1-hour PM2.5 or the 24-hour PSI?
- What is PM2.5 and why does it matter?
- What do NEA's PM2.5 bands and PSI bands mean?
- Who counts as vulnerable in haze?
- When are schools closed because of haze?
- Why do apps show different numbers: US AQI, Singapore PSI and Malaysia API?