Air quality in Cayenne, French Guiana, France today
Mr. Duck’s Air Quality Score
Moderate air today for Cayenne, French Guiana, 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 Cayenne today is classified as Moderate. The primary pollutant identified is PM2.5. The assessment is based on four valid measurements collected from monitoring stations, with the most recent reading recorded at 2026-02-23 12:00 UTC. All four observations were taken within the same day and are included in the current summary.
Measured concentrations indicate a PM2.5 level of 18.1 µg/m³ and a PM10 level of 40.4 µg/m³. These figures reflect the data shown via OpenAQ and represent the values used to determine the Moderate category. The PM2.5 measurement corresponds to the reference value of 18.1 µg/m³, and the PM10 measurement corresponds to its reference value of 40.4 µg/m³. 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 Cayenne city air‑quality feed pulls data from two monitoring stations and contains eight individual rows of observations. Five of those rows have been updated within the last 30 days, while three are classified as older, so the overall picture is a mix of recent and dated information. All five measured pollutants—carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm (PM10) and particulate matter 2.5 µm (PM2.5)—appear in the dataset, but the freshness varies by pollutant.
For the particulate fractions the most recent timestamp is 2026‑02‑10 15:00 UTC. PM10 values span from 36.8 µg/m³ up to 40.4 µg/m³, with a median of about 38.6 µg/m³ and a tight inter‑percentile range (37.2‑40.0 µg/m³), indicating limited variability across the recent measurements. PM2.5 shows a similar pattern, ranging from 18.1 µg/m³ to 22.2 µg/m³, a median of 20.2 µg/m³ and a 10‑90 percentile band of roughly 18.5‑21.8 µg/m³. Carbon monoxide is reported as a single recent value of 1 025.0 µg/m³ from the same 2026‑02‑10 update, providing a clear snapshot for that pollutant.
In contrast, the NO₂ and O₃ entries both carry a placeholder value of –1.0 µg/m³ and were last refreshed on 2024‑05‑30 08:00 UTC, which the system flags as old data. This suggests that current measurements for these gases are missing or not available, and the dataset relies on outdated placeholders for them. Consequently, while the recent particulate and CO data give a fairly current view of Cayenne’s air quality, the older NO₂ and O₃ records highlight gaps that could affect a complete assessment of conditions across the city.
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
This dataset includes four valid measurements and is updated within 30 days. The latest data were recorded on 2026-02-10T15:00:00+00:00. While these values reflect current conditions, air quality can vary by location and time within the city, so the snapshot may not represent every neighborhood or moment.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Caiena3 | pm10 | 40.4 | µg/m³ | 2026-02-10 15:00 UTC |
| Caiena3 | pm25 | 22.2 | µg/m³ | 2026-01-26 17:00 UTC |
| Cayenne-Bouchon | pm10 | 36.8 | µg/m³ | 2026-02-10 15:00 UTC |
| Cayenne-Bouchon | pm25 | 18.1 | µg/m³ | 2026-02-10 15:00 UTC |