Worst air pollution Diepkloof - Johannesburg, today and tomorrow
Today (20 September): Air quality in Diepkloof is poor. AQI, PM2.5, NO2, and PM1 are poor; PM10, SO2, and HCHO are moderate; O3 is fair; CO is good. Pollution peaks around 7:00 PM (NO2: 74.1/100).
Tomorrow (21 September 2026): Air quality in Diepkloof is very poor. AQI worsens to very poor; NO2 increases to very poor; HCHO increases to poor; PM1 increases to very poor; all other pollutants stay as today. Pollution peaks around 7:00 PM (NO2: 100/100). 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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At Diepkloof, vehicle traffic and government, finance, and commercial operations are the dominant local sources shaping air quality on the Highveld plateau. Calm winter mornings allow emissions to build up under a low inversion layer, while the arrival of summer rains and stronger winds generally restores clearer conditions. Similar patterns show up in most Highveld towns of a similar size.
Today - 20 September | Pollution peaks at 19:00
AQI:
Poor
74.1/100
PM2.5 (fine particles):
Poor
60.4/100
PM10 (coarse particles):
Moderate
45.5/100
NO2 (nitrogen dioxide):
Poor
74.1/100
O3 (ozone):
Fair
35.8/100
SO2 (sulfur dioxide):
Moderate
45.7/100
CO (carbon monoxide):
Good
2.8/100
HCHO (formaldehyde):
Moderate
53.7/100
PM1 (ultrafine particles):
Poor
71.2/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 19:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Poor
76.2/100
PM10 (coarse particles):
Moderate
55.9/100
NO2 (nitrogen dioxide):
Very poor
100/100
O3 (ozone):
Fair
35.0/100
SO2 (sulfur dioxide):
Moderate
54.7/100
CO (carbon monoxide):
Good
4.2/100
HCHO (formaldehyde):
Poor
62.5/100
PM1 (ultrafine particles):
Very poor
90.5/100
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Frequently Asked Questions
Is air quality bad in Diepkloof right now?
On 20 September 2026, overall air quality in Diepkloof is poor. AQI is the main air quality indicator at 74.1/100. Pollution peaks around 7:00 PM (NO2: 74.1/100).
Will air quality be worse tomorrow in Diepkloof?
On 21 September 2026, air quality conditions in Diepkloof will be worse than today, with AQI forecast at very poor at 100/100. Pollution peaks around 7:00 PM (NO2: 100/100).
When is air pollution at its worst in Diepkloof?
Diepkloof sees its poorest air quality on windless winter mornings, when a low temperature inversion traps local emissions and those from government, finance, and commercial operations nearby. Summer's arrival from November brings stronger winds and thunderstorms that usually restore clearer conditions for months at a time, a seasonal pattern typical of the wider Highveld plateau.
Are air quality levels in Diepkloof 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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