Air quality in Aosta, Aosta Valley, Italy today
Mr. Duck’s Air Quality Score
Moderate air today for Aosta, Aosta Valley, Italy
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Aosta today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).
Measurements from OpenAQ show a PM2.5 reference value of 10.9 and a PM10 reference value of 12.3, based on seven valid observations collected for the city. This information reflects the current assessment without additional interpretation.
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 Aosta air‑quality dataset currently contains measurements for five pollutants – nitrogen dioxide (NO₂), ozone (O₃), particulate matter 1 µm (PM₁), particulate matter 10 µm (PM₁₀) and particulate matter 2.5 µm (PM₂.5). These data come from a total of eleven rows collected at three monitoring stations in the city.
The most recent values are fairly fresh for four of the pollutants, with the latest timestamps recorded on 2026‑02‑09 03:00 UTC for NO₂, PM₁₀ and PM₂.5, and on 2025‑12‑31 09:00 UTC for O₃. The PM₁ data are older, last updated on 2024‑03‑11 10:00 UTC, so the coverage for this size fraction is less current than the others. Across all pollutants the median concentrations fall within a narrow band: NO₂ averages 17.98 µg/m³ (range 4.21–18.36), O₃ shows a much wider spread with a median of 141.5 µg/m³ and extremes from 17.2 to 265.8, while the particulate metrics are low‑level, with PM₁ ranging 1.2–1.6 µg/m³ (median 1.4), PM₁₀ from 6.9 to 12.3 µg/m³ (median 9.6) and PM₂.5 between 5.9 and 10.9 µg/m³ (median 8.4). The 10th‑percentile values sit close to the minima for each pollutant, indicating that most recent observations cluster near the lower end of their respective ranges.
Overall, the dataset provides a modest snapshot of Aosta’s air quality: three stations supply recent readings for four pollutants, but PM₁ is represented only by older data. Because the number of rows is limited and some measurements are dated, conditions can differ across neighborhoods and times not captured here.
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 Aosta includes seven valid measurements and was updated within three days, with the latest refresh recorded at 2026‑02‑09T03:00:00+00:00. These values represent a recent snapshot of ambient conditions across the city’s monitoring network. Keep in mind that air quality can differ by specific location and time of day within Aosta, so individual experiences may vary from the reported figures.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Aosta Liconi | no2 | 17.98 | µg/m³ | 2026-02-09 03:00 UTC |
| Aosta Liconi | o3 | 265.8 | µg/m³ | 2025-12-31 09:00 UTC |
| AOSTA I maggio | no2 | 18.36 | µg/m³ | 2026-02-09 03:00 UTC |
| AOSTA I maggio | pm1 | 1.2 | µg/m³ | 2024-03-11 10:00 UTC |
| AOSTA I maggio | pm10 | 12.3 | µg/m³ | 2026-02-09 03:00 UTC |
| AOSTA I maggio | pm25 | 10.9 | µg/m³ | 2026-02-09 03:00 UTC |
| AOSTA (PIAZZA PLOUVES) | no2 | 4.21 | µg/m³ | 2026-02-09 03:00 UTC |
| AOSTA (PIAZZA PLOUVES) | o3 | 17.2 | µg/m³ | 2025-12-31 09:00 UTC |
| AOSTA (PIAZZA PLOUVES) | pm1 | 1.6 | µg/m³ | 2024-03-11 10:00 UTC |
| AOSTA (PIAZZA PLOUVES) | pm10 | 6.9 | µg/m³ | 2026-02-09 03:00 UTC |
| AOSTA (PIAZZA PLOUVES) | pm25 | 5.9 | µg/m³ | 2026-02-09 03:00 UTC |