Air quality in Saint-Denis, Réunion, France today

Mr. Duck’s Air Quality Score

Good air today for Saint-Denis, Réunion, 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 Saint‑Denis today is classified as Good. The primary pollutant measured is PM2.5, with a reference concentration of 7.8 µg/m³, while the accompanying PM10 level stands at 13.2 µg/m³ based on ten valid observations.

Data are shown via OpenAQ and reflect the current monitoring results 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 Saint‑Denis air‑quality feed contains six measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or less (PM10), fine particulate matter 2.5 µm or less (PM2.5) and sulphur dioxide (SO₂). Data come from a total of thirteen rows recorded at three monitoring sites across the city, so each pollutant is not necessarily represented at every location.

The most recent observations were uploaded on 2026‑02‑10 15:00 UTC for O₃, NO₂, PM10, PM2.5 and SO₂, while the latest NO value dates back to 2024‑03‑11 09:00 UTC, making it the oldest entry in the set. Across the pollutants the recorded concentrations span relatively narrow ranges: O₃ varies from a minimum of 50.3 µg/m³ to a maximum of 54.3 µg/m³ with a median of 53.6 µg/m³; NO runs between 0.4 and 2.0 µg/m³ (median 1.2); NO₂ is observed from 1.6 up to 8.2 µg/m³ (median ≈ 4.9); PM10 ranges 6.7–13.2 µg/m³ (median ≈ 10.0); PM2.5 spans 3.5–7.8 µg/m³ (median ≈ 5.7); and SO₂ is measured between 0.1 and 1.1 µg/m³ (median ≈ 0.6). The 10th‑percentile values sit close to the minima for each pollutant, while the 90th‑percentile values are near the maxima, indicating limited variability among the recent samples.

Because most of the data were refreshed within the last month, the snapshot reflects fairly current conditions for five of the six pollutants, but the older NO reading highlights a gap in timely coverage. With only three stations contributing, spatial representation is modest; concentrations can differ across neighborhoods and times not captured by this limited set. Users should keep in mind that the figures describe specific moments at particular sites rather than a comprehensive city‑wide picture.

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 Saint‑Denis includes ten valid measurements and is updated within three days, with the most recent data recorded on 2026‑02‑10 at 15:00 UTC. These values provide a current snapshot of ambient conditions but reflect only the specific monitoring points and times captured; air quality can vary across different neighborhoods and moments throughout the city.

OpenAQ station rows