Worst air pollution Welkom, today and tomorrow
Today (9 August): Air quality in Welkom is fair. PM1 is fair; AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, and HCHO are good. Pollution peaks around 2:00 PM (O3: 45.2/100).
Tomorrow (10 August 2026): Air quality in Welkom is good. AQI improves to good; O3 decreases to good; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 18.6/100). Airmine updates local air quality forecasts four times daily.
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Welkom's air quality reflects the Free State Goldfields' major gold mining city, with the Harmony Gold and Sibanye operations generating elevated mine dust and cyanide processing byproducts alongside vehicle traffic on the N30. Winter Highveld temperature inversions concentrate mining dust and vehicle emissions, while the elevated 1,370-metre Highveld position aids background dispersal on windy summer days and the gold mining legacy represents the most distinctive local air quality source throughout the year.
Today - 9 August | Pollution peaks at 14:00
AQI:
Medium
45.2/100
PM2.5 (fine particles):
Good
15.3/100
PM10 (coarse particles):
Good
4.1/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Medium
45.2/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.7/100
PM1 (ultrafine particles):
Fair
21.1/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 10:00
AQI:
Good
18.6/100
PM2.5 (fine particles):
Good
8.1/100
PM10 (coarse particles):
Good
2.2/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Good
18.6/100
SO2 (sulfur dioxide):
Good
0.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.1/100
PM1 (ultrafine particles):
Good
11.2/100
Pollen forecast in Welkom
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Frequently Asked Questions
Is air quality bad in Welkom right now?
On 9 August 2026, overall air quality in Welkom is fair. PM1 is the main pollutant at 21.1/100. Pollution peaks around 2:00 PM (O3: 45.2/100).
Will air quality be worse tomorrow in Welkom?
On 10 August 2026, air quality conditions in Welkom will be better than today, with AQI forecast at good at 18.6/100. Pollution peaks around 10:00 AM (O3: 18.6/100).
When is air pollution at its worst in Welkom?
Air quality at Welkom is most likely to dip during the dry winter months from May to August, when temperature inversions trap vehicle and household emissions close to the ground on still mornings. Conditions improve markedly once the summer rains arrive from November, as stronger winds and regular thunderstorms clear the plateau air for the rest of the season.
Are air quality levels in Welkom based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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