Worst air pollution Kroonstad, today and tomorrow
Today (20 September): Air quality in Kroonstad is moderate. AQI, PM2.5, NO2, and PM1 are moderate; PM10, O3, and SO2 are fair; CO and HCHO are good. Pollution peaks around 9:00 PM (PM1: 46.2/100).
Tomorrow (21 September 2026): Air quality in Kroonstad is moderate. NO2 decreases to fair; SO2 decreases to good; all other pollutants stay as today. Pollution peaks around 9:00 PM (PM1: 50.6/100). Airmine updates local air quality forecasts four times daily.
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Kroonstad's air quality reflects its position on the Vaal River in the Free State province, with vehicle traffic on the N1 national road and the surrounding grain farming, coal transport corridor, and light industry contributing local sources. The flat Free State Highveld generally allows reasonable wind dispersal on most days, while winter Highveld temperature inversions concentrate vehicle and coal-related emissions across the low-lying Vaal floodplain, and the regional coal transport from the Highveld coalfields adds background PM2.5 throughout the year.
Today - 20 September | Pollution peaks at 21:00
AQI:
Moderate
46.2/100
PM2.5 (fine particles):
Moderate
42.4/100
PM10 (coarse particles):
Fair
21.8/100
NO2 (nitrogen dioxide):
Moderate
43.0/100
O3 (ozone):
Fair
24.2/100
SO2 (sulfur dioxide):
Fair
30.4/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
6.2/100
PM1 (ultrafine particles):
Moderate
46.2/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 21:00
AQI:
Moderate
50.6/100
PM2.5 (fine particles):
Moderate
45.3/100
PM10 (coarse particles):
Fair
26.2/100
NO2 (nitrogen dioxide):
Fair
34.7/100
O3 (ozone):
Fair
21.7/100
SO2 (sulfur dioxide):
Good
13.9/100
CO (carbon monoxide):
Good
1.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Moderate
50.6/100
Pollen forecast in Kroonstad
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Frequently Asked Questions
Is air quality bad in Kroonstad right now?
On 20 September 2026, overall air quality in Kroonstad is moderate. AQI is the main air quality indicator at 46.2/100. Pollution peaks around 9:00 PM (PM1: 46.2/100).
Will air quality be worse tomorrow in Kroonstad?
On 21 September 2026, air quality conditions in Kroonstad will be similar to today, with AQI forecast at moderate at 50.6/100. Pollution peaks around 9:00 PM (PM1: 50.6/100).
When is air pollution at its worst in Kroonstad?
Air quality at Kroonstad 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 Kroonstad 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: 20 September 2026 at 14:33 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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