Air Quality Index (AQI) in Czechia 🇨🇿

Live Air Quality Index (AQI) and PM2.5 Levels in Czechia

Currently, the Air Quality Index (AQI) in Prague, the capital of Czechia, is measured at a score of 43. According to the US EPA health standard, this air quality rating is categorized as Good. The current atmosphere in Prague is influenced by a PM2.5 (fine particulate matter) concentration of 7.7 µg/m³ and PM10 levels recorded at 10.6 µg/m³. Monitoring of gaseous pollutants shows Nitrogen Dioxide (NO2) at 7.2 µg/m³.

Beyond the primary urban hubs, atmospheric conditions and smog levels fluctuate across Czechia based on industrial output, traffic density, and local weather patterns. Real-time pollution data and respiratory health alerts are also being actively monitored in cities like Brno, Ostrava, Pilsen, Liberec and Olomouc. Tracking these air quality metrics is essential for residents nationwide to manage outdoor exposure and maintain respiratory safety during periods of increased particulate concentration.

Air Quality Snapshot: Czechia Right Now

Across 12 monitored cities in Czechia, live air quality currently ranges from a low of 28 AQI in Olomouc (the cleanest air right now) to a high of 43 AQI in Prague (the most polluted). By US EPA health band, the nationwide distribution stands at 12 Good. The average fine-particulate (PM2.5) concentration across these cities is 5.7 µg/m³ — approximately 1.1 times the World Health Organization (WHO) annual air quality guideline of 5 µg/m³.

Czechia Air Quality: Major Cities Index

* Air Quality Index (AQI) data for Czechia is calculated using the US EPA standard. Information is processed from multiple monitoring stations detecting PM2.5, PM10, and gaseous pollutants to ensure accuracy for respiratory health planning.

What Today's Readings Mean in Czechia

The median reading across 12 monitored cities is 31.0 AQI. The national spread is 15 points, from 28 in Olomouc to 43 in Prague. Average PM2.5 is 5.7 µg/m³ (1.1× the WHO annual guideline).

All monitored locations are currently in the Good range. Normal outdoor activity is appropriate for most people.

See the complete AQI and pollutant reference scales

Health & Scientific Resources

→ How to read US EPA Air Quality Index before going outside → Understanding Air Quality Index levels and what they mean → When haze forms and what it does to air quality

Air Quality in Czechia — FAQ

Common questions about AQI levels, pollutants, and data sources for Czechia.

What is the current air quality in Czechia?

Live AQI readings for 12 city(ies) across Czechia are listed above on the US EPA 0-500 scale.

Where does Czechia's AQI data come from?

Real-time readings come from ground-based monitoring stations operated by national environmental agencies in Czechia, delivered via WeatherAPI.com and aggregated using the EPA AQI formula.

What is a healthy AQI value in Czechia?

On the EPA scale used worldwide, 0-50 is Good, 51-100 is Moderate, 101-150 is Unhealthy for sensitive groups, 151-200 is Unhealthy, 201-300 is Very Unhealthy, and 301-500 is Hazardous. The WHO 24-hour PM2.5 guideline is 15 μg/m³.

Why do AQI readings vary between cities in Czechia?

Air quality is highly local — major pollution sources (traffic, industry, dust, wildfires) cluster around cities, while wind direction and topography move them around. Comparing nearby readings on this page is the best way to see how conditions change across Czechia.