Air quality in Crolles, Auvergne-Rhône-Alpes, France today

Mr. Duck’s Air Quality Score

Good air today for Crolles, Auvergne-Rhône-Alpes, France

⚠️ 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 Crolles today is classified as Good. The primary pollutant measured is PM2.5, with a reference concentration of 4.9 µg/m³ reported from four valid observations.

PM10 was also recorded, showing a reference value of 6.0 µg/m³ based on the same set of measurements. 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 dataset for Crolles contains measurements of five key air‑quality 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 values come from a single monitoring location identified as Gresivaudan Periurb, so the city’s coverage is limited to one station and five rows of data.

The most recent readings are very fresh for four of the pollutants: NO₂, O₃, PM10 and PM2.5 were all updated on 2026‑02‑10 at 15:00 UTC, which falls within the “updated within three days” freshness bucket. In contrast, the NO measurement is older, last recorded on 2024‑03‑11 at 09:00 UTC, and is flagged as “old data”. Because each pollutant has only one reported value, there is no observed spread – the minimum, median and maximum are identical for every parameter (NO 9.6 µg/m³, NO₂ 8.3 µg/m³, O₃ 48.0 µg/m³, PM10 6.0 µg/m³, PM2.5 4.9 µg/m³). This uniformity means the dataset does not capture variability across time or space within Crolles.

Overall, the data set offers a snapshot rather than a continuous record: one station supplies all five pollutant readings, with four of them being very recent and one lagging by almost two years. Consequently, while the current values give an immediate picture for most pollutants, they do not reflect possible fluctuations throughout the city or over longer periods. Users should keep in mind that conditions can differ across neighborhoods and times beyond what this limited set captures.

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 Crolles includes four valid measurements and is refreshed regularly, having been updated within the past three days (last update: 2026‑02‑10 15:00 UTC). These values represent a snapshot of ambient conditions at the time of collection; air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in this summary.

OpenAQ station rows