Air quality in Bratislava, Region of Bratislava, Slovakia today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Bratislava, Region of Bratislava, Slovakia

⚠️ 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 today in Bratislava is classified as USG. The primary pollutant identified is PM2.5, with a measured concentration of 45.33 µg/m³ based on five valid observations.

Data are shown via OpenAQ and reflect the current monitoring results for fine particulate matter. 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 OpenAQ feed for Bratislava currently contains data from nine monitoring rows covering ten measured substances: carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter of 1 µm (PM1), 2.5 µm (PM2.5) and 10 µm (PM10) size fractions, relative humidity, sulfur dioxide (SO₂), temperature and a miscellaneous parameter labelled UM003. Across the dataset only two pollutants have recent updates: PM2.5, PM1 and relative humidity were last refreshed on 2026‑02‑10 at 20:00 UTC, while all other substances – CO, NO₂, O₃, SO₂, PM10 – show their most recent records from 2024‑01‑29 at 19:00 UTC. In total, forty rows are present, but twenty‑one of them are flagged as “unknown” in terms of freshness, and fourteen are classified as old; only five rows contain data that is less than seven days old.

The available measurements show a wide spread for several pollutants. PM2.5 values range from 6.3 µg/m³ up to 45.33 µg/m³ with a median of about 16 µg/m³, while the single‑point PM1 reading sits at 27.37 µg/m³. CO concentrations vary between roughly 348 µg/m³ and 646 µg/m³, centred around a median of 500 µg/m³. NO₂ spans from 13 µg/m³ to 62.5 µg/m³ (median ≈ 24 µg/m³), and SO₂ ranges from 0.64 µg/m³ to 12.06 µg/m³ (median ≈ 3 µg/m³). Ozone values are between 0.85 µg/m³ and 47.5 µg/m³, with a median near 25.7 µg/m³, while PM10 records sit from 14.5 µg/m³ to 33.5 µg/m³ (median ≈ 22.6 µg/m³). Relative humidity is reported as a single value of about 53.8 %.

Because many rows are old or lack a clear freshness label, the snapshot does not capture the full day‑to‑day variability that can occur across different neighbourhoods in Bratislava. Users should keep in mind that conditions may differ from the values shown here, especially for pollutants whose latest data are more than two years old.

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 Bratislava reflects five valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 20:00 UTC. This snapshot provides a current view of air quality across the Region of Bratislava, but conditions can differ by specific location and time of day within the city.

OpenAQ station rows