SmogRank / World / Africa / South Africa / Free State
Most polluted cities in Free State, South Africa
0 measured cities, this year.
No city has enough measurements for this window yet.
China's Air Quality Index (HJ 633-2012), PM2.5 individual index. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Estimated: cities without a monitor
Free State cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Bloemfontein | ≈ 8 µg/m³ |
| Welkom | ≈ 12 µg/m³ |
| Botshabelo | ≈ 8 µg/m³ |
| Virginia | ≈ 12 µg/m³ |
| Kroonstad | ≈ 12 µg/m³ |
| Kutloanong | ≈ 12 µg/m³ |
| Bethlehem | ≈ 10 µg/m³ |
| Phuthaditjhaba | ≈ 10 µg/m³ |
| Odendaalsrus | ≈ 12 µg/m³ |
| Thaba Nchu | ≈ 8 µg/m³ |
| Bothaville | ≈ 12 µg/m³ |
| Parys | ≈ 15 µg/m³ |
| Viljoenskroon | ≈ 12 µg/m³ |
| Ficksburg | ≈ 12 µg/m³ |
| Wesselsbron | ≈ 11 µg/m³ |
| Senekal | ≈ 11 µg/m³ |
| Theunissen | ≈ 10 µg/m³ |
| Harrismith | ≈ 11 µg/m³ |
| Heilbron | ≈ 14 µg/m³ |
| Allanridge | ≈ 12 µg/m³ |
| Frankfort | ≈ 15 µg/m³ |
| Ladybrand | ≈ 11 µg/m³ |
| Bultfontein | ≈ 9 µg/m³ |
| Phomolong | ≈ 12 µg/m³ |
| Reitz | ≈ 11 µg/m³ |
| Deneysville | ≈ 17 µg/m³ |
| Hennenman | ≈ 12 µg/m³ |
| Vrede | ≈ 11 µg/m³ |
| Hlohlolwane | ≈ 11 µg/m³ |
| Villiers | ≈ 13 µg/m³ |
| Hoopstad | ≈ 11 µg/m³ |
| Zastron | ≈ 7 µg/m³ |
| Marquard | ≈ 11 µg/m³ |
| Tshiame | ≈ 10 µg/m³ |
| Vredefort | ≈ 12 µg/m³ |
| Winburg | ≈ 10 µg/m³ |
| Koppies | ≈ 13 µg/m³ |
| Fouriesburg | ≈ 10 µg/m³ |
| Winnie Mandela | ≈ 8 µg/m³ |
| Mamafubedu | ≈ 12 µg/m³ |
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SmogRank, most polluted cities in Free State, South Africa, PM2.5, this year to 2 Oct 2026, 04:00 UTC, smogrank.com/za/region/free-state?w=year.
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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the China AQI PM2.5 sub-index.