Worst air pollution Ostrava, today and tomorrow
Today (16 July): Air quality in Ostrava is medium. AQI, PM2.5, NO2, O3, and PM1 are medium; PM10, SO2, CO, and HCHO are good. Pollution peaks around 5:00 PM (O3: 55.2/100).
Tomorrow (17 July 2026): Air quality in Ostrava is medium. All pollutants stay as today. Pollution peaks around 1:00 PM (O3: 59.5/100). 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 - 16 July | Pollution peaks at 17:00
AQI:
Medium
55.2/100
PM2.5 (fine particles):
Medium
40.3/100
PM10 (coarse particles):
Good
12.0/100
NO2 (nitrogen dioxide):
Medium
44.1/100
O3 (ozone):
Medium
55.2/100
SO2 (sulfur dioxide):
Good
13.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.9/100
PM1 (ultrafine particles):
Medium
42.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 13:00
AQI:
Medium
59.5/100
PM2.5 (fine particles):
Medium
41.3/100
PM10 (coarse particles):
Good
13.0/100
NO2 (nitrogen dioxide):
Medium
48.9/100
O3 (ozone):
Medium
59.5/100
SO2 (sulfur dioxide):
Good
13.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.8/100
PM1 (ultrafine particles):
Medium
44.6/100
Pollen forecast in Ostrava
View pollen forecastFrequently Asked Questions
Is air quality bad in Ostrava right now?
On 16 July 2026, overall air quality in Ostrava is medium. AQI is the main air quality indicator at 55.2/100. Pollution peaks around 5:00 PM (O3: 55.2/100).
Will air quality be worse tomorrow in Ostrava?
On 17 July 2026, air quality conditions in Ostrava will be similar to today, with AQI forecast at medium at 59.5/100. Pollution peaks around 1:00 PM (O3: 59.5/100).
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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app