Air quality in Opava, Moravia-Silesia, Czechia today

Mr. Duck’s Air Quality Score

Moderate air today for Opava, Moravia-Silesia, Czechia

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Opava today is classified as Moderate. The primary pollutant identified is PM2.5, with a measured concentration of 28.87 µg/m³ based on ten valid observations reported through OpenAQ.

These figures reflect the current monitoring snapshot for the city. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The Opava air‑quality feed contains eight measured variables – nitrogen oxides (NO and NO2), ozone (O3), three size fractions of particulate matter (PM1, PM2.5 and PM10), relative humidity, temperature and particle count (UM003). Data come from four monitoring rows in total; two of those rows are recent (updated within the last three days) while the other two are older, with the most dated entries from September 2024 for NO2 and O3 and from December 2025 for PM10. The freshest timestamps across the dataset are from 2026‑02‑10 18:00 UTC for PM1, PM2.5, relative humidity, temperature and UM003, showing that at least half of the parameters reflect conditions measured only a few days ago.

Across the recent measurements, PM2.5 values range from about 5.8 to 28.9 µg/m³ with a median near 20.1 µg/m³, while PM1 spans roughly 13.5 to 22.6 µg/m³ and has a median of 18.1 µg/m³. Ozone concentrations in the older record vary between 60.6 and 113.7 µg/m³ (median 87.2), and nitrogen dioxide stays low, from 1.0 to 5.7 µg/m³ (median 3.35). Relative humidity recorded at the Zelná site moves between 40.4 % and 47.8 % (median 44.1 %), and temperature there ranges from about 11.0 °C to 16.6 °C (median 13.8 °C). Particle counts (UM003) are reported between roughly 2,232 and 3,795 particles per cm³ (median 3,014).

Because half of the stations provide data that is several months old, the picture of Opava’s air quality is incomplete for some pollutants. The recent rows give a fairly detailed snapshot of particulate matter, humidity and temperature at one location, but NO2 and O3 are only represented by older measurements from a different site, so conditions can differ across the city and over time.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The data shown for Opava are based on ten valid measurements and were updated within 3 days, with the latest refresh recorded at 2026‑02‑10T18:00:00+00:00. This snapshot reflects conditions measured at specific monitoring points; air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows