Singapore PSI and PM2.5 history
Hourly 24-hr PSI and PM2.5 history for North, South, East, West and Central Singapore, up to 30 days, with gaps left empty rather than estimated.
| Region | 24-hr PSI (official) | 1-hr PM2.5 µg/m³ (official) | 24-hr PM2.5 µg/m³ (official) | US AQI, PM2.5 only (AirAware estimate) |
|---|---|---|---|---|
| North | 129 (Unhealthy) | 74 · Band II · Elevated | 83 | 170 (Unhealthy) |
| South | 171 (Unhealthy) | 98 · Band II · Elevated | 122 | 198 (Unhealthy) |
| East | 180 (Unhealthy) | 89 · Band II · Elevated | 131 | 206 (Very Unhealthy) |
| West | 222 (Very Unhealthy) | 135 · Band II · Elevated | 171 | 246 (Very Unhealthy) |
| Central | 184 (Unhealthy) | 104 · Band II · Elevated | 135 | 210 (Very Unhealthy) |
MOH advice at the highest regional 24-hr PSI 222 (Very unhealthy): healthy persons: avoid prolonged or strenuous outdoor physical exertion; elderly, pregnant women and children: minimise outdoor activity; people with chronic lung or heart disease: avoid outdoor activity.
The app charts hourly values for up to 30 days. Gaps are left empty: missing hours are never filled with estimates. Hourly history is available as JSON from /api/air-quality/history.
Source: National Environment Agency (NEA) via data.gov.sg, Singapore Open Data Licence v1.0. Health guidance: Ministry of Health (MOH) and US EPA. AirAware is not affiliated with NEA, MOH or the US EPA and does not provide medical advice. For official information, see haze.gov.sg.
Data: latest readings (JSON) · 7-day history (JSON) · llms.txt