Air quality in City of Zagreb, Croatia today

Mr. Duck’s Air Quality Score

Unhealthy air today for City of Zagreb, Croatia

⚠️ 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 Zagreb is classified as Unhealthy. The primary pollutant identified is PM2.5, with a measured concentration of 60.35 µg/m³. In addition, the level of PM10 recorded is 22.9 µg/m³.

A total of fifteen valid measurements contribute to this assessment. Data is shown via OpenAQ. 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 Zagreb contains data from six monitoring stations reported in twenty‑nine individual rows. All ten measured variables are represented: carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter of three size fractions (PM₁, PM₂·₅ and PM₁₀), relative humidity, sulfur dioxide (SO₂), temperature, and particle number concentration (UM003). The most recent observations are fairly current for most pollutants: the latest PM₁, PM₂·₅, relative humidity, temperature and UM003 values were recorded on 2026‑02‑10 at 22:00 UTC, while PM₁₀, NO₂ and O₃ were last updated on 2026‑02‑09 at 03:00 UTC. No rows are flagged as “unknown” for these key parameters, indicating that the dataset is largely complete in terms of timestamp coverage.

Across the city the recorded concentrations show a modest spread. PM₁₀ values range from 21.3 to 24.8 µg/m³ with a median of about 23.25 µg/m³, while PM₂·₅ varies more widely from 24.3 to 80.5 µg/m³ and has a median near 54.6 µg/m³. The particle number concentration (UM003) spans roughly 2 870 to 5 613 particles/cm³, with the typical value around 4 107. Temperature measurements are clustered between 10.3 °C and 12.3 °C, medianing at 11.2 °C, and relative humidity sits between 45.6 % and 65.3 %, medianing near 61.5 %. NO₂ shows a narrower band from 16.1 to 24.7 µg/m³ (median 20.4), whereas O₃ is reported as a single constant value of 12.4 µg/m³ in the current snapshot.

Because the data come from only six stations, spatial variation within Zagreb may not be fully captured; some pollutants have fewer reporting rows (e.g., NO₂ and O₃ each with two recent entries) compared with others that have four recent observations. Nonetheless, the dataset provides a contemporary picture of air quality across multiple key metrics, with most values refreshed within the past few days.

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 dataset for Zagreb includes 15 valid measurements and is updated within 3 days, with the most recent data recorded on 2026‑02‑10 at 22:00 UTC. These values represent a citywide average at the time of collection; air quality can vary by location and moment throughout Zagreb, so conditions you experience locally may differ from this snapshot.

OpenAQ station rows