Worst air pollution Heidelberg (Gauteng), today and tomorrow
Today (9 August): Air quality in Heidelberg (Gauteng) is poor. AQI, O3, and SO2 are poor; PM10 is fair; PM2.5, NO2, HCHO, and PM1 are medium; CO is good. Pollution peaks around 2:00 AM (SO2: 74.2/100).
Tomorrow (10 August 2026): Air quality in Heidelberg (Gauteng) is fair. AQI improves to medium; PM2.5 decreases to good; PM10 decreases to good; NO2 increases to fair; O3 decreases to fair; SO2 decreases to medium; HCHO increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 AM (SO2: 42.0/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Heidelberg (Gauteng) lies roughly 50 km southeast of Johannesburg. Air quality at Heidelberg (Gauteng) is shaped by its Highveld plateau setting, where vehicle traffic and government, finance, and commercial operations are the main local sources of particulate pollution. Dry winter mornings often see temperature inversions trap emissions near the surface, while summer rains and afternoon winds typically improve dispersal conditions. This mirrors what's typical for towns across the wider plateau region.
Today - 9 August | Pollution peaks at 02:00
AQI:
Poor
74.2/100
PM2.5 (fine particles):
Medium
50.4/100
PM10 (coarse particles):
Fair
23.3/100
NO2 (nitrogen dioxide):
Medium
55.9/100
O3 (ozone):
Poor
64.8/100
SO2 (sulfur dioxide):
Poor
74.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Medium
52.5/100
PM1 (ultrafine particles):
Medium
57.1/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 00:00
AQI:
Medium
42.0/100
PM2.5 (fine particles):
Good
19.2/100
PM10 (coarse particles):
Good
5.2/100
NO2 (nitrogen dioxide):
Fair
24.7/100
O3 (ozone):
Fair
21.6/100
SO2 (sulfur dioxide):
Medium
42.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
23.0/100
PM1 (ultrafine particles):
Fair
25.0/100
Pollen forecast in Heidelberg (Gauteng)
View pollen forecastFrequently Asked Questions
Is air quality bad in Heidelberg (Gauteng) right now?
On 9 August 2026, overall air quality in Heidelberg (Gauteng) is poor. AQI is the main air quality indicator at 74.2/100. Pollution peaks around 2:00 AM (SO2: 74.2/100).
Will air quality be worse tomorrow in Heidelberg (Gauteng)?
On 10 August 2026, air quality conditions in Heidelberg (Gauteng) will be better than today, with PM1 forecast at fair at 25.0/100. Pollution peaks around 12:00 AM (SO2: 42.0/100).
When is air pollution at its worst in Heidelberg (Gauteng)?
The dry Highveld winter brings the worst air quality to Heidelberg (Gauteng), as calm mornings let emissions from government, finance, and commercial operations linger close to the ground. Once summer rains arrive around November, stronger winds and regular storms typically clear the air across the wider plateau, a seasonal pattern typical of the wider Highveld plateau.
Are air quality levels in Heidelberg (Gauteng) 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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