Worst air pollution Karlštejn, today and tomorrow
Today (9 August): Air quality in Karlštejn is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 44.0/100).
Tomorrow (10 August 2026): Air quality in Karlštejn is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 37.0/100). Airmine updates local air quality forecasts four times daily.
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Karlštejn's setting in the Berounka river valley beneath Karlštejn Castle means summer tourist traffic and vehicle traffic in the valley drives most of the local variation in air quality across the year. The Central Bohemian Region terrain nearby can trap emissions under stable conditions, though stronger winds or rainfall usually bring noticeable improvement, and residents typically notice the clearest air during the more unsettled, windier stretches of the year.
Today - 9 August | Pollution peaks at 15:00
AQI:
Medium
44.0/100
PM2.5 (fine particles):
Good
9.0/100
PM10 (coarse particles):
Good
2.5/100
NO2 (nitrogen dioxide):
Good
8.3/100
O3 (ozone):
Medium
44.0/100
SO2 (sulfur dioxide):
Good
1.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.9/100
PM1 (ultrafine particles):
Good
12.2/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 10:00
AQI:
Fair
37.0/100
PM2.5 (fine particles):
Good
8.4/100
PM10 (coarse particles):
Good
3.3/100
NO2 (nitrogen dioxide):
Good
7.5/100
O3 (ozone):
Fair
37.0/100
SO2 (sulfur dioxide):
Good
1.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.5/100
PM1 (ultrafine particles):
Good
11.3/100
Pollen forecast in Karlštejn
View pollen forecastSports venues in Karlštejn
Frequently Asked Questions
Is air quality bad in Karlštejn right now?
On 9 August 2026, overall air quality in Karlštejn is medium. AQI is the main air quality indicator at 44.0/100. Pollution peaks around 3:00 PM (O3: 44.0/100).
Will air quality be worse tomorrow in Karlštejn?
On 10 August 2026, air quality conditions in Karlštejn will be worse than today, with AQI forecast at fair at 37.0/100. Pollution peaks around 10:00 AM (O3: 37.0/100).
When is air pollution at its worst in Karlštejn?
The clearest dips in Karlštejn's air quality track oak and hornbeam pollen peaks and periods of summer tourist traffic and vehicle traffic in the valley; the rest of the year typically brings clearer, more consistent conditions for the Central Bohemian Region area, particularly once autumn winds set in and the local terrain ventilates more easily than during calmer stretches.
Are air quality levels in Karlštejn 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: 9 August 2026 at 20:27 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.
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