Worst air pollution Porterville, today and tomorrow
Today (20 September): Air quality in Porterville is moderate. AQI, PM2.5, and PM1 are moderate; PM10 and O3 are fair; NO2, SO2, CO, and HCHO are good. Pollution peaks around 11:00 PM (PM2.5: 53.7/100).
Tomorrow (21 September 2026): Air quality in Porterville is moderate. O3 decreases to good; all other pollutants stay as today. Pollution peaks around 12:00 AM (PM2.5: 53.3/100). Airmine updates local air quality forecasts four times daily.
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Porterville lies roughly 110 km north-northeast of Cape Town. Vehicle traffic and sheep farming and small-town activity shape most of the local air quality picture at Porterville, set within the vast, arid Karoo landscape. The region's typically windy, open conditions keep pollution levels low, aside from occasional dust events during dry, still weather. Much of the surrounding Karoo sees broadly the same seasonal pattern.
Today - 20 September | Pollution peaks at 23:00
AQI:
Moderate
53.7/100
PM2.5 (fine particles):
Moderate
53.7/100
PM10 (coarse particles):
Fair
29.0/100
NO2 (nitrogen dioxide):
Good
17.9/100
O3 (ozone):
Fair
23.9/100
SO2 (sulfur dioxide):
Good
9.9/100
CO (carbon monoxide):
Good
1.7/100
HCHO (formaldehyde):
Good
11.9/100
PM1 (ultrafine particles):
Moderate
52.7/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 00:00
AQI:
Moderate
53.3/100
PM2.5 (fine particles):
Moderate
53.3/100
PM10 (coarse particles):
Fair
27.3/100
NO2 (nitrogen dioxide):
Good
19.3/100
O3 (ozone):
Good
19.6/100
SO2 (sulfur dioxide):
Good
7.6/100
CO (carbon monoxide):
Good
1.8/100
HCHO (formaldehyde):
Good
10.6/100
PM1 (ultrafine particles):
Moderate
51.8/100
Pollen forecast in Porterville
View pollen forecastFrequently Asked Questions
Is air quality bad in Porterville right now?
On 20 September 2026, overall air quality in Porterville is moderate. AQI is the main air quality indicator at 53.7/100. Pollution peaks around 11:00 PM (PM2.5: 53.7/100).
Will air quality be worse tomorrow in Porterville?
On 21 September 2026, air quality conditions in Porterville will be similar to today, with AQI forecast at moderate at 53.3/100. Pollution peaks around 12:00 AM (PM2.5: 53.3/100).
When is air pollution at its worst in Porterville?
Air quality at Porterville stays good for most of the year given the region's remoteness, though dry, windy spells in late winter and spring can occasionally stir up dust tied to sheep farming and small-town activity. Conditions generally settle again once the wind drops or rain arrives, a seasonal pattern typical of the wider Karoo interior.
Are air quality levels in Porterville 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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