Air quality in Saint-Jean-sur-Richelieu, Quebec, Canada today

Mr. Duck’s Air Quality Score

Good air today for Saint-Jean-sur-Richelieu, Quebec, Canada

⚠️ 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 Saint‑Jean‑sur‑Richelieu is currently classified as Good. The primary pollutant measured today is PM2.5, with a reported concentration of 8.4 µg/m³ based on seven valid observations from OpenAQ.

No other pollutants reached reporting thresholds, and the overall assessment reflects favorable conditions for the area 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 OpenAQ feed for Saint‑Jean‑sur‑Richelieu currently provides data from two monitoring stations, giving a total of seven recent rows across six measured variables. All six pollutants recorded at the site are available: ozone (O3), fine particulate matter (PM2.5), ultrafine particles (PM1), relative humidity, temperature and particle count (UM003). The most recent update for each pollutant was logged on 2026‑02‑10 at 22:00 UTC, so the dataset is fresh within the last three days.

Across the two stations the observed values show a narrow spread. Ozone is constant at 0.032 ppm, while PM2.5 ranges from 5.52 to 8.4 µg/m³ with a median of about 6.96 µg/m³; the inter‑decile range (10th–90th percentile) runs from roughly 5.81 to 8.11 µg/m³, indicating modest variability. PM1 is recorded at a single value of 1.2555 µg/m³, and relative humidity sits at 36.9 % with no variation in the current rows. Temperature is likewise fixed at 1.94 °C, and the particle concentration (UM003) is reported as 295.86 particles per cm³ throughout.

Because each pollutant has only one or two recent entries, the coverage is limited: PM2.5 benefits from two rows that capture a small range of concentrations, whereas the other parameters are represented by single observations. This means that while the data are up‑to‑date, they provide only a snapshot rather than a detailed temporal profile, and conditions in different parts of Saint‑Jean‑sur‑Richelieu may differ from what these point measurements show.

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 reflects seven valid measurements and is marked as “Updated within 3 days,” with the most recent reading recorded on 2026‑02‑10 at 22:00 UTC. This snapshot provides a brief overview of current conditions, but air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in these figures.

OpenAQ station rows