Sierra Leone · Africa/Freetown
Freetown air quality
19
Good
CAMS model-based US AQI estimate
Highest pollutant sub-index: O3
Model values for Oct 02 07:00 GMT · CAMS model estimate, may differ from monitoring stations and street-level conditions
Data may be delayed
AirNow by Skymory is an independent service; it is not affiliated with or endorsed by U.S. EPA or the official AirNow service.
Pollutants now (modeled)
- PM2.5Fine particles1.7 µg/m³
- PM10Coarse particles2.3 µg/m³
- O3Ozone40.0 µg/m³
- NO2Nitrogen dioxide1.7 µg/m³
- SO2Sulphur dioxide0.5 µg/m³
- COCarbon monoxide135.9 µg/m³
Weather in Freetown
See the temperature, rain and wind forecast for Freetown.
Freetown weather forecast on SkymoryNext 24 hours: PM2.5
Pollutant forecast
Hourly model samples in local time; no interpolation.
| Local time | PM2.5 µg/m³ | PM10 µg/m³ | O3 µg/m³ | NO2 µg/m³ | SO2 µg/m³ | CO µg/m³ |
|---|---|---|---|---|---|---|
| 1.8 | 2.3 | 39.6 | 1.6 | 0.5 | 141.3 | |
| 1.4 | 2.0 | 45.0 | 1.0 | 0.5 | 135.4 | |
| 1.3 | 1.8 | 48.0 | 0.7 | 0.5 | 134.2 | |
| 1.2 | 1.6 | 50.0 | 0.5 | 0.4 | 134.0 | |
| 1.0 | 1.4 | 51.7 | 0.4 | 0.4 | 130.8 | |
| 0.9 | 1.3 | 51.9 | 0.3 | 0.3 | 128.4 | |
| 0.9 | 1.3 | 51.2 | 0.3 | 0.3 | 125.8 | |
| 1.0 | 1.5 | 50.3 | 0.3 | 0.2 | 123.6 | |
| 1.1 | 1.7 | 50.6 | 0.4 | 0.2 | 123.3 | |
| 1.3 | 2.1 | 49.3 | 0.5 | 0.2 | 124.4 | |
| 1.5 | 2.4 | 48.0 | 0.7 | 0.2 | 124.6 | |
| 1.7 | 2.7 | 46.1 | 0.8 | 0.2 | 124.8 | |
| 2.1 | 3.4 | 43.2 | 0.9 | 0.2 | 123.5 | |
| 2.4 | 3.7 | 39.4 | 1.0 | 0.2 | 122.8 | |
| 2.5 | 3.8 | 37.4 | 0.9 | 0.2 | 120.7 | |
| 2.5 | 3.9 | 36.8 | 0.8 | 0.2 | 119.6 | |
| 2.7 | 4.2 | 36.1 | 0.8 | 0.2 | 116.7 | |
| 2.7 | 4.3 | 35.3 | 0.8 | 0.2 | 114.7 | |
| 2.8 | 4.6 | 35.2 | 0.8 | 0.2 | 113.8 | |
| 2.9 | 4.8 | 36.3 | 0.7 | 0.2 | 113.1 | |
| 2.9 | 4.8 | 36.1 | 0.8 | 0.2 | 113.4 | |
| 3.1 | 5.1 | 36.6 | 0.8 | 0.2 | 113.3 | |
| 3.4 | 5.5 | 37.5 | 0.8 | 0.2 | 113.0 | |
| 3.6 | 5.8 | 37.2 | 0.9 | 0.3 | 114.6 |
Data details: about this air quality estimate
Values are modeled by the Copernicus Atmosphere Monitoring Service (CAMS) global forecast, extracted and converted by Skymory for this city. They are model estimates on a coarse grid, not measurements from monitoring stations, and they do not resolve street-level exposure.
- Model initialization: 2026-10-01T12:00:00+00:00. Values valid: Oct 02 07:00 GMT. Retrieved: 2026-10-02T04:31:38.154367+00:00.
- Page generated from a snapshot with data state STALE_USABLE; model age 19.9 hours at generation.
- Nearest valid 0.4° model grid cell, about 10 km from the city point.
- Gases are converted with matching model-level 137 temperature, humidity, surface pressure (lnsp) and hybrid coefficients; particulate matter is read directly from the surface fields.
- AQI estimate completeness: COMPLETE (COMPLETE means all six pollutants have a complete model window).
The AQI estimate applies EPA breakpoints (May 2026) to explicit trailing model windows (PM 24 h, CO 8 h, NO2 1 h, SO2 and O3 per EPA rules). It is not a station observation, official daily maximum or NowCast, and the official AQI field remains unavailable.
Averaging windows used
- CO: 8h window
- NO2: 1h window
- O3: 1h, 8h window
- PM10: 24h window
- PM2.5: 24h window
- SO2: 1h, 24h window
Surface compatibility by pollutant
| Pollutant | Surface compatibility |
|---|---|
| PM2.5 | DIRECT_SURFACE |
| PM10 | DIRECT_SURFACE |
| O3 | DERIVABLE_SURFACE |
| NO2 | DERIVABLE_SURFACE |
| SO2 | DERIVABLE_SURFACE |
| CO | DERIVABLE_SURFACE |
Source and license
Contains modified Copernicus Atmosphere Monitoring Service information 2026; city extraction and concentration conversion. CAMS global atmospheric composition forecasts (ECMWF/CAMS). CC BY 4.0.
Provider times stay separate from page generation: collecting data or regenerating this page never resets the source time. Data sources and methodology
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