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

Mr. Duck’s Air Quality Score

Good air today for Blois, 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 Blois today is classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 1.3 and a PM10 reference value of 2.0, based on six valid observations collected via OpenAQ.

These figures indicate that the monitored concentrations are within the ranges associated with the Good category for this location. 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 Blois air‑quality dataset contains five measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), fine particulate matter (PM₂.5) and coarse particulate matter (PM₁₀). Data come from three monitoring stations that together provide 16 recent rows of observations. For most compounds the latest values were recorded on 2026‑02‑10 at 15:00 UTC, which falls within a three‑day freshness window; the exception is NO, whose newest entry dates back to 2024‑03‑11 at 09:00 UTC and is therefore older than the other parameters.

Across the recent records the observed concentrations span a fairly wide range. NO₂ values vary from a low of 1.9 µg/m³ up to 19.2 µg/m³, with a median around 9.5 µg/m³; PM₂.5 ranges between 1.3 and 25.7 µg/m³, centred near 6.0 µg/m³; O₃ shows the highest absolute levels, from 39.0 to 80.68 µg/m³ with a median of 56.1 µg/m³; PM₁₀ is measured between 2.0 and 15.35 µg/m³, median 10.5 µg/m³; NO is the least recent but still spans 1.5 to 26.1 µg/m³ with a typical value of about 2.2 µg/m³. The 10th‑percentile figures (e.g., 2.71 µg/m³ for NO₂, 2.24 µg/m³ for PM₂.5) indicate that low concentrations are common, while the 90th‑percentile values (17.76 µg/m³ for NO₂, 21.76 µg/m³ for PM₂.5) show occasional higher readings.

Because the dataset relies on only three stations, spatial coverage is limited and conditions can differ across neighbourhoods. The overall freshness is good for four of the five pollutants, but the older NO record highlights an uneven update frequency. Users should keep in mind that the numbers represent snapshots from specific sites and times rather than a continuous 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 data shown for Blois reflects six valid measurements and is updated within three days, with the most recent update recorded at 2026‑02‑10T15:00:00+00:00. This snapshot provides a current view of city‑wide air quality but note that conditions can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in Blois.

OpenAQ station rows