Air quality
Air quality in Centurion today
Updated
Moderate (US AQI 62) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Tue, Oct 27, 6:00 am (04:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Centurion, Gauteng, South Africa, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 62 Moderate
- PM2.5
- 19 µg/m³ 1.3× WHO 24-h guideline
- PM10
- 19 µg/m³
- Ozone
- 57 µg/m³
- Dominant pollutant
- PM2.5 sub-index 62
- Best hour today
- 9:00 pm AQI 57
- European AQI
- 42
Air quality in Centurion right now
Right now the modelled US Air Quality Index for Centurion, Gauteng, South Africa is 62, which falls in the "Moderate" band (up to 100). Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
The index is driven mainly by PM2.5, whose own sub-index is 62. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.
PM2.5 is 19 µg/m³, 1.3 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 19 µg/m³ against a guideline of 45; ozone is 57 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 28 µg/m³ (above the 24-hour guideline of 25).
Also this hour: sulphur dioxide at 42 µg/m³, carbon monoxide 237 µg/m³.
NASA FIRMS shows 289 fire hotspots within 300 km in the last day (nearest about 16 km), but particle levels are not elevated enough to point to smoke right now.
Centurion AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 50 around Wed 6:00 am to 85 around Tue 4:00 pm, from "Good" at best to "Moderate" at worst.
The following day looks similar, averaging about 62.
| Local time (Africa/Johannesburg) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Tue 6:00 am | 62 | Moderate | 19.1 | 19 | 57 |
| Tue 9:00 am | 61 | Moderate | 17.4 | 18 | 129 |
| Tue 12:00 pm | 62 | Moderate | 8.7 | 9 | 145 |
| Tue 3:00 pm | 81 | Moderate | 2.6 | 3 | 108 |
| Tue 6:00 pm | 79 | Moderate | 3.6 | 4 | 91 |
| Tue 9:00 pm | 57 | Moderate | 8.6 | 9 | 63 |
| Wed 12:00 am | 54 | Moderate | 8.1 | 9 | 51 |
| Wed 3:00 am | 52 | Moderate | 6.1 | 6 | 36 |
| Wed 6:00 am | 50 | Good | 7.7 | 8 | 39 |
| Wed 9:00 am | 42 | Good | 10.8 | 11 | 87 |
| Wed 12:00 pm | 40 | Good | 14.7 | 15 | 142 |
| Wed 3:00 pm | 58 | Moderate | 14.7 | 15 | 157 |
| Wed 6:00 pm | 107 | Unhealthy for Sensitive Groups | 13.9 | 14 | 114 |
| Wed 9:00 pm | 85 | Moderate | 17.8 | 18 | 56 |
| Thu 12:00 am | 56 | Moderate | 17.5 | 18 | 41 |
| Thu 3:00 am | 58 | Moderate | 10.4 | 12 | 46 |
| Thu 6:00 am | 59 | Moderate | 9.1 | 11 | 50 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in Centurion today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 9:00 pm (AQI 57, Moderate) and the worst around 4:00 pm (AQI 85). That is a swing of 28 points, so a run or walk around 9:00 pm is noticeably better.
Centurion vs the rest of South Africa
Across 50 South Africa cities we track, the average US AQI right now is 52 (Moderate). Centurion at 62 is 10 points worse than average.
It ranks 32 of 50 from cleanest to most polluted; the cleanest is Queenstown (22) and the most polluted Emalahleni (67).
For context, the median across 4,024 cities worldwide is 56.
Air quality in cities near Centurion
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Pretoria | 13 km | 58 | Moderate | 13.5 |
| Thembisa | 16 km | 61 | Moderate | 17.9 |
| Randburg | 32 km | 62 | Moderate | 19.1 |
| Benoni | 39 km | 61 | Moderate | 17.9 |
| Germiston | 40 km | 61 | Moderate | 17.9 |
| Boksburg | 40 km | 61 | Moderate | 17.9 |
| Johannesburg | 41 km | 66 | Moderate | 25 |
| Mabopane | 41 km | 58 | Moderate | 13.5 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Centurion, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Advice for sensitive groups
At 62, most people are fine outdoors. If you are unusually sensitive to PM2.5, keep long or intense workouts to the cleaner hours shown above.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for Centurion
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.