Air quality in Ostrava, Moravia-Silesia, Czechia today

Mr. Duck’s Air Quality Score

Moderate air today for Ostrava, 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 Ostrava today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 31.4 and a PM10 reference value of 46.1, based on 13 valid observations recorded via OpenAQ.

Data reflect the current conditions without interpretation or recommendation. 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 data set for Ostrava in the Moravia‑Silesia region contains measurements for carbon monoxide (CO), nitrogen oxides (NO and NO₂), ozone (O₃), particulate matter of both size fractions (PM₁₀ and PM₂.₅) and sulfur dioxide (SO₂). In total 26 individual rows have been recorded across six monitoring stations, giving a modest spatial coverage for the city.

Most pollutants are represented by very recent observations: CO, NO₂, PM₁₀, PM₂.5, SO₂, O₃ and their latest values were all logged on 2026‑02‑10 at 14:00 UTC, which is within three days of the current date. The only older entry is for NO, whose most recent measurement dates back to 2024‑03‑11 at 10:00 UTC and is flagged as “old data”. Across the whole collection, fourteen rows are fresh (updated within three days), twelve are classified as old and none are unknown.

The recorded concentrations show a fairly wide spread. For NO₂ the values range from 9.4 to 25.1 µg/m³ with a median of about 14 µg/m³; PM₁₀ varies between 6.6 and 46.1 µg/m³, centred around a median of 25 µg/m³; SO₂ spans 1.3 to 10.9 µg/m³ with a median near 6.7 µg/m³. Ozone levels are consistently higher, ranging from 64.6 to 102.3 µg/m³ and clustering around an 83 µg/m³ median. CO is reported as a single constant value of 480 µg/m³ at the Ceskobratrsk site.

Because the number of rows differs markedly between pollutants—six for NO₂, five each for PM₁₀, SO₂ and PM₂.5, four for NO, two for O₃ and only one for CO—the picture of air quality is uneven. While most recent data are available for several key contaminants, the older NO record and limited station count mean that conditions can still vary across different parts of Ostrava and at times not captured by this snapshot.

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 set for Ostrava includes 13 valid measurements and is marked as Updated within 3 days, with the latest values recorded on 2026‑02‑10 at 14:00 UTC. These figures represent a snapshot of current conditions; air quality can differ across neighborhoods and change throughout the day, so local variations may not be reflected in this summary.

OpenAQ station rows