Air quality in Cherbourg-en-Cotentin, Normandy, France today

Mr. Duck’s Air Quality Score

Good air today for Cherbourg-en-Cotentin, Normandy, 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 Cherbourg‑en‑Cotentin is currently classified as Good. The main pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 2.4 and a PM10 reference value of 7.1, based on six valid observations collected via OpenAQ.

These figures indicate that the monitored concentrations are within the limits associated with the Good category for today. 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 Cherbourg‑en‑Cotentin air quality dataset currently contains measurements for five 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). The data come from three monitoring stations, giving a total of eleven individual rows across the pollutants.

The most recent observations are generally very fresh: NO₂, PM₁₀, O₃ and PM₂.5 were all last updated on 2026‑02‑10 at 15:00 UTC, which falls within the “updated within three days” freshness bucket. In contrast, the sole NO reading is older, recorded on 2024‑03‑11 at 09:00 UTC and flagged as old data. This means that for four of the five pollutants the city’s current conditions are captured in near‑real time, while NO coverage relies on a single historic value.

Across the recent measurements the concentration ranges are modest. NO₂ values span from a minimum of 2.4 µg/m³ to a maximum of 9.4 µg/m³, with a median around 9.2 µg/m³ at the Cherbourg PMF site. PM₁₀ varies between 5.4 and 13.8 µg/m³, centering near 7.1 µg/m³ at the Hotel de Ville station. Ozone shows a broader spread from 50.1 up to 82.0 µg/m³, median 66.05 µg/m³, also recorded at the Hotel de Ville site. PM₂.5 is low‑level, ranging from 2.4 to 7.0 µg/m³ with a typical value of 4.7 µg/m³ at the same location. The lone NO measurement sits at 3.9 µg/m³.

Overall, the dataset offers recent coverage for most pollutants but is uneven: four pollutants have multiple recent rows, while NO is represented by a single older entry. Consequently, city‑wide air quality snapshots are reliable for NO₂, O₃, PM₁₀ and PM₂.5, whereas NO information reflects an earlier period and may not represent current conditions.

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 Cherbourg‑en‑Cotentin is based on six valid measurements and was updated within three days, with the latest refresh recorded at 2026‑02‑10T15:00:00+00:00. This snapshot reflects conditions at the time of collection; however, air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows