Air quality in Cluj-Napoca, Romania today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Cluj-Napoca, Romania

⚠️ 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 Cluj‑Napoca is classified as USG today. The primary pollutant identified is PM2.5, with a measured concentration of 39.5 µg/m³. In addition, PM10 levels are recorded at 28.9 µg/m³ based on 23 valid measurements collected via OpenAQ.

Data for this assessment reflect the current monitoring snapshot and do not imply any trend or forecast. 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 Cluj‑Napoca currently provides data on ten measured variables: carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter of three size fractions (PM1, PM2.5, PM10), relative humidity, sulfur dioxide (SO₂), temperature and a miscellaneous sensor labelled UM003. These observations come from 53 rows spread across nine distinct monitoring stations, giving the city a modest but multi‑point coverage network.

Freshness varies by pollutant. The most recent readings were recorded on 2026‑02‑10 at either 19:00 UTC or 20:00 UTC. PM10, NO₂, SO₂ and CO all have their latest values timestamped at 19:00 UTC, while PM2.5, PM1, temperature and the other available metrics were last updated at 20:00 UTC. The “updated within 7 days” flag applies to every pollutant, indicating that none of the data are older than a week, though some series contain only a handful of recent rows (for example CO is based on four rows from three stations).

Across the dataset the measured concentrations show a wide spread. PM10 values range from about 12 µg/m³ up to 66 µg/m³, with a median near 29 µg/m³; PM2.5 spans 11 µg/m³ to 40 µg/m³, median roughly 17 µg/m³. NO₂ varies between 33 µg/m³ and 52 µg/m³ (median 46 µg/m³), while O₃ stays tighter, from 22 µg/m³ to 30 µg/m³ with a single recorded value of 21.7 µg/m³ at the latest timestamp. CO exhibits an extreme range, from –1000 µg/m³ up to 720 µg/m³, reflecting possible sensor calibration issues; the highest recent reading is 719.6 µg/m³. Temperature measurements cover a modest interval of about 7 °C to 21 °C (median 8 °C).

Overall the dataset offers recent snapshots for most pollutants but the number of observations differs markedly between them, and some values—particularly CO—appear anomalous. Because monitoring points are limited and timestamps cluster around a single day, conditions in other parts of Cluj‑Napoca or at different times may not be fully represented.

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 current dataset for Cluj‑Napoca includes 23 valid measurements and is marked as Updated within 3 days, with the latest values recorded on 2026‑02‑10 at 20:00 UTC. These figures represent a snapshot of conditions across the monitoring network; air quality can differ by specific location and time of day within the city, so individual experiences may vary from the reported averages.

OpenAQ station rows