Air quality in Zalău, Romania today
Mr. Duck’s Air Quality Score
Good air today for Zalău, Romania
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Zalău is classified as Good today. The primary pollutant measured is PM10, with a recorded concentration of 24.61 µg/m³ based on three valid observations from OpenAQ data.
No additional pollutants reached notable levels in the available measurements. 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 Zalău air‑quality dataset contains measurements for five pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or less (PM₁₀) and sulfur dioxide (SO₂). The data come from six individual rows recorded at two monitoring stations, so each pollutant is represented by a single recent observation except for NO₂, which has two separate entries. Overall the most up‑to‑date values were logged on 2026‑02‑10 19:00 UTC, giving the dataset a very fresh snapshot for CO, PM₁₀ and SO₂, while O₃ is only available from an older record dated 2022‑04‑28 07:00 UTC. NO₂ shows one recent entry (2026‑02‑10 19:00 UTC) and one slightly older but still within the last week.
The numeric spread varies across pollutants. CO registers a single value of 320.79 µg/m³, while SO₂ is measured at 5.47 µg/m³ and PM₁₀ at 24.61 µg/m³ – each with no observed variation because only one row exists for those species. NO₂ presents the widest range, from a minimum of 4.32 µg/m³ to a maximum of 25.36 µg/m³, with a median of 14.84 µg/m³ and the 10th‑percentile at 6.43 µg/m³, indicating some variability within the limited sample. O₃ is represented by a single constant value of 46.63 µg/m³.
Because most pollutants are captured in only one recent row, the dataset offers a very narrow temporal picture for Zalău; conditions can differ across neighborhoods and over time. The presence of two stations improves spatial coverage modestly, yet the limited number of rows means that any single measurement may not reflect broader city‑wide air quality trends.
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 Zalău is based on three valid measurements and was updated within 3 days, with the latest reading recorded at 2026‑02‑10T19:00:00+00:00. This snapshot reflects conditions at a specific time and place; air quality can differ across neighborhoods and fluctuate throughout the day, so values may not represent the entire city at any given moment.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| RO0181A | no2 | 4.32241974 | µg/m³ | 2023-05-29 10:00 UTC |
| RO0181A | o3 | 46.62919777 | µg/m³ | 2022-04-28 07:00 UTC |
| SJ-1 | no2 | 25.35693 | µg/m³ | 2026-02-10 19:00 UTC |
| SJ-1 | pm10 | 24.60597 | µg/m³ | 2026-02-10 19:00 UTC |
| SJ-1 | so2 | 5.46725 | µg/m³ | 2026-02-10 19:00 UTC |