Worst air pollution Ostrava, today and tomorrow
Today (30 August): Air quality in Ostrava is moderate. AQI, NO2, and PM1 are moderate; PM2.5 and O3 are fair; PM10, SO2, CO, and HCHO are good. Pollution peaks around 2:00 AM (NO2: 44.7/100).
Tomorrow (31 August 2026): Air quality in Ostrava is fair. AQI improves to fair; NO2 decreases to fair; PM1 decreases to fair; all other pollutants stay as today. Pollution peaks around 1:00 AM (NO2: 33.8/100). 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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Ostrava's air quality faces some of the EU's most serious industrial air quality challenges, with the ArcelorMittal steelworks and surrounding coking plant complex in the Ostrava-Karviná coal basin generating some of Europe's highest PM2.5, SO₂, and benzo[a]pyrene concentrations. The flat Silesian basin shared with Polish Katowice across the border provides reasonable wind dispersal on most days, but the density of steel and coking operations keeps Ostrava among the Czech Republic's and EU's most persistently polluted cities.
Today - 30 August | Pollution peaks at 02:00
AQI:
Moderate
44.7/100
PM2.5 (fine particles):
Fair
32.1/100
PM10 (coarse particles):
Good
9.1/100
NO2 (nitrogen dioxide):
Moderate
44.7/100
O3 (ozone):
Fair
32.7/100
SO2 (sulfur dioxide):
Good
7.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.8/100
PM1 (ultrafine particles):
Moderate
40.0/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 01:00
AQI:
Fair
33.8/100
PM2.5 (fine particles):
Fair
24.6/100
PM10 (coarse particles):
Good
7.1/100
NO2 (nitrogen dioxide):
Fair
33.8/100
O3 (ozone):
Fair
33.6/100
SO2 (sulfur dioxide):
Good
6.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.2/100
PM1 (ultrafine particles):
Fair
31.0/100
Pollen forecast in Ostrava
View pollen forecastFrequently Asked Questions
Is air quality bad in Ostrava right now?
On 30 August 2026, overall air quality in Ostrava is moderate. AQI is the main air quality indicator at 44.7/100. Pollution peaks around 2:00 AM (NO2: 44.7/100).
Will air quality be worse tomorrow in Ostrava?
On 31 August 2026, air quality conditions in Ostrava will be better than today, with AQI forecast at fair at 33.8/100. Pollution peaks around 1:00 AM (NO2: 33.8/100).
When is air pollution at its worst in Ostrava?
Residents in Ostrava are most likely to spot reduced air quality when oak and birch pollen peaks, or due to the ArcelorMittal steelworks and nearby coking plant complex in the Ostrava-Karviná coal basin; a change of season or a spell of wind usually clears things up again.
Are air quality levels in Ostrava 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: 30 August 2026 at 20:26 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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