Ostrava Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Ostrava is fair. AQI, PM2.5, and NO2 are fair; PM10, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (PM2.5: 26.0/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Ostrava is moderate. AQI worsens to moderate; PM2.5 increases to moderate; PM10 increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 AM (PM2.5: 40.7/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 26.0/100 |
| PM2.5 (fine particles) | Fair | 26.0/100 |
| PM10 (coarse particles) | Good | 13.4/100 |
| NO2 (nitrogen dioxide) | Fair | 23.2/100 |
| O3 (ozone) | Good | 14.7/100 |
| SO2 (sulfur dioxide) | Good | 2.4/100 |
| CO (carbon monoxide) | Good | 0.7/100 |
| HCHO (formaldehyde) | Good | 2.6/100 |
| PM1 (ultrafine particles) | Good | 16.3/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 40.7/100 |
| PM2.5 (fine particles) | Moderate | 40.7/100 |
| PM10 (coarse particles) | Fair | 20.9/100 |
| NO2 (nitrogen dioxide) | Fair | 22.0/100 |
| O3 (ozone) | Good | 15.6/100 |
| SO2 (sulfur dioxide) | Good | 2.6/100 |
| CO (carbon monoxide) | Good | 0.9/100 |
| HCHO (formaldehyde) | Good | 2.0/100 |
| PM1 (ultrafine particles) | Fair | 28.1/100 |
Local Environmental Conditions
With buildings covering much of the area around the heart of Ostrava, traffic and other urban emissions are the biggest local influence on air quality. Local sources include steelmaking. Home heating, especially wood stoves and fireplaces, adds smoke and fine particles in the colder months. Trees nearby help filter some particles from the air, though in hot weather they also emit compounds that feed ozone formation.
Hot afternoons from July to August, averaging 21°C in the warmest month, are when ozone is most likely to build up. Later, the cooler months, November to April, see more fine particles, as home heating and traffic add emissions while frequent calm, cold mornings around 1°C keep pollution near the ground. January is usually the windiest month, averaging about 20 km/h, which helps keep the air clean.
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Frequently Asked Questions About Air Quality in Moravskoslezský Kraj
Is air quality bad in Ostrava right now?
On 10 October 2026, overall air quality in Ostrava is fair. AQI is the main air quality indicator at 26.0/100. Pollution peaks around 10:00 PM (PM2.5: 26.0/100).
Will air quality be worse tomorrow in Ostrava?
On 11 October 2026, air quality conditions in Ostrava will be worse than today, with AQI forecast at moderate at 40.7/100. Pollution peaks around 8:00 AM (PM2.5: 40.7/100).
When is air pollution at its worst in Ostrava?
Hot afternoons from July to August, averaging 21°C in the warmest month, are when ozone is most likely to build up. Later, the cooler months, November to April, see more fine particles, as home heating and traffic add emissions while frequent calm, cold mornings around 1°C keep pollution near the ground. January is usually the windiest month, averaging about 20 km/h, which helps keep the air clean.
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.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |