Air quality in Montesson, Ile-de-France, France today

Mr. Duck’s Air Quality Score

Good air today for Montesson, Ile-de-France, 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 Montesson today is classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 0.033 µg/m³, based on five valid observations recorded by OpenAQ.

Overall conditions meet the Good category criteria, with no additional pollutants reported at this time. 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 Montesson monitoring set consists of a single measurement row that reports six pollutants: PM1, PM10, PM2.5, relative humidity, temperature and the particle count UM003. Because there is only one station contributing data, the coverage is limited to this location rather than representing the whole city.

Freshness varies across the parameters. The most recent readings for PM1, PM2.5, relative humidity, temperature and UM003 were all recorded on 2026-02-10 at 18:00 UTC, so those values are up‑to‑date within the last three days. In contrast, the latest PM10 value dates back to 2025-01-13 at 23:00 UTC, making it more than a year old and flagged as “old data.” This uneven timestamp distribution means that while most pollutants reflect current conditions, the PM10 figure may no longer be representative of today’s air.

All reported concentrations are identical across their statistical summaries because each pollutant has only one recorded value. PM1 registers at 0.0 µg/m³, PM2.5 at 0.03333333333333333 µg/m³ and PM10 at 50.375 µg/m³. Relative humidity is steady at 70.33333333333333 %, temperature at 14.70649995803833 °C and the particle count UM003 at 88.79733327229816 particles/cm³. The lack of variation (minimum, median, maximum and percentiles are the same) highlights that the dataset does not capture any range or trend for these metrics.

Given the single‑station setup and the outdated PM10 entry, users should keep in mind that conditions can differ across Montesson and over time, and the available data provide only a snapshot of one point rather than a comprehensive citywide 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 Montesson reflects five valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 18:00 UTC. This snapshot provides a current view of air quality across the city, but conditions can differ by specific neighbourhoods and change throughout the day, so local variations may not be captured in these figures.

OpenAQ station rows