Air quality in Chartres, Centre-Val de Loire, France today

Mr. Duck’s Air Quality Score

Good air today for Chartres, Centre-Val de Loire, 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 Chartres today is classified as Good. The primary pollutant measured is PM2.5, with a recorded concentration of 6.1 µg/m³. In addition, the level of PM10 has been observed at 9.0 µg/m³ based on five valid measurements reported through OpenAQ.

These values reflect the current monitoring snapshot for Chartres in the Centre‑Val de Loire region. 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 Chartres includes five measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), fine particulate matter (PM₂.5) and coarse particulate matter (PM10). Data come from seven rows of observations collected at three monitoring stations, so each pollutant is not necessarily represented at every location. The most recent measurements were recorded on 2026‑02‑10 at 15:00 UTC for O₃, PM₂.5, PM10 and NO₂, all flagged as “updated within 3 days”. In contrast, the NO value originates from an older record dated 2024‑03‑11 at 09:00 UTC and is labelled “old data”, indicating a gap of almost two years for that specific metric.

Across the recent observations, ozone values range from 65.2 to 75.63 µg/m³ with a median of about 70.4 µg/m³, showing a relatively tight spread (10th percentile ≈ 66.24, 90th percentile ≈ 74.59). PM₂.5 shows more variability: the minimum recorded is 6.1 µg/m³, the maximum 16.8 µg/m³ and the median sits at 11.45 µg/m³, with the central 80 % of values lying between roughly 7.2 and 15.7 µg/m³. PM10 is represented by a single constant reading of 9.0 µg/m³ from the Fulbert station, so no range can be derived for this pollutant at present. NO₂ is also reported as a single value of 20.6 µg/m³, while NO remains a solitary figure of 16.3 µg/m³ from the Chartres_trafic sensor.

Overall, the dataset provides fresh coverage for four of the five pollutants, but the presence of only one recent reading for PM10 and NO₂ limits insight into their temporal dynamics. The older NO measurement highlights uneven data freshness across contaminants, meaning that while current ozone and fine‑particle conditions are well captured, assessments of nitrogen oxides rely on less up‑to‑date information. Consequently, city‑wide air quality snapshots may vary depending on the pollutant and monitoring location considered.

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 are based on five valid measurements and have been refreshed recently, with the latest update recorded on 2026‑02‑10 at 15:00 UTC; they are considered “Updated within 3 days.” This snapshot reflects conditions measured at specific monitoring points and times, but air quality can differ across neighborhoods and throughout the day in Chartres, Centre‑Val de Loire.

OpenAQ station rows