Air quality in Saint-Martin-d'Hères, Auvergne-Rhône-Alpes, France today
Mr. Duck’s Air Quality Score
Good air today for Saint-Martin-d'Hères, Auvergne-Rhône-Alpes, France
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Saint‑Martin‑d’Hères is classified as Good today. The primary pollutant measured is PM2.5, with a reported concentration of 5.1 µg/m³, while PM10 stands at 8.7 µg/m³ based on three valid observations from OpenAQ.
These values reflect the current monitoring snapshot for the city. 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 dataset for Saint‑Martin‑d’Hères contains measurements from five individual rows, each representing a single monitoring point that reports one of the five tracked pollutants: nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or less (PM₁₀) and particulate matter 2.5 µm or less (PM₂.₅). All five substances are covered, but the timing of the latest observations differs across them. The most recent values for O₃, PM₁₀ and PM₂.₅ were recorded on 2026‑02‑10 at 15:00 UTC, indicating that these three pollutants have fresh data within the last few days. In contrast, the NO reading dates back to 2024‑03‑11 09:00 UTC and the NO₂ reading to 2024‑03‑18 07:00 UTC, so those two gases are represented only by older measurements.
Each pollutant currently shows a single reported value because the minimum, median and maximum are identical for every row. The recorded concentrations are 12.6 µg/m³ for NO, 20.3 µg/m³ for NO₂, 31.7 µg/m³ for O₃, 8.7 µg/m³ for PM₁₀ and 5.1 µg/m³ for PM₂.₅. Because there is no spread in the data, the median values are exactly those same numbers, providing a clear snapshot but no indication of variability over time or across locations within the city.
Overall, the coverage includes all five key pollutants but leans heavily toward recent information for ozone and particulates while nitrogen oxides rely on older entries. With only five rows feeding the dataset, the picture of air quality in Saint‑Martin‑d’Hères is limited to these specific points and timestamps; conditions can differ across neighborhoods and moments that are not captured by the current records.
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 Saint‑Martin‑d’Hères is based on three valid measurements and was updated within three days, with the latest refresh recorded at 15:00 UTC on 10 February 2026. These figures represent a snapshot of ambient conditions; air quality can differ across neighborhoods and change throughout the day, so values may not reflect conditions everywhere in the city at any given moment.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| St Martin d'Heres | no | 12.6 | µg/m³ | 2024-03-11 09:00 UTC |
| St Martin d'Heres | no2 | 20.3 | µg/m³ | 2024-03-18 07:00 UTC |
| St Martin d'Heres | o3 | 31.7 | µg/m³ | 2026-02-10 15:00 UTC |
| St Martin d'Heres | pm10 | 8.7 | µg/m³ | 2026-02-10 15:00 UTC |
| St Martin d'Heres | pm25 | 5.1 | µg/m³ | 2026-02-10 15:00 UTC |