Air quality in Leeds and the Thousand Islands, Ontario, Canada today

Mr. Duck’s Air Quality Score

Moderate air today for Leeds and the Thousand Islands, Ontario, 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 Leeds and the Thousand Islands today falls into the Moderate category. The primary pollutant measured is PM2.5 (fine particles), with a reported concentration of 9.78 µg/m³ based on five valid observations from OpenAQ.

Overall, the data indicate a moderate level of particulate matter without additional pollutants reported. 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

Leeds and the Thousand Islands – Ontario’s OpenAQ feed contains six rows of data from a single monitoring location, each row reporting one of six measured pollutants: PM1, PM10, PM2.5, relative humidity, temperature and UM003 (particle count). The most recent measurements were recorded on 2026‑02‑10 at 22:00 UTC for five of the pollutants, showing that the dataset is generally fresh. The exception is PM10, whose latest entry dates back to 2025‑01‑13 at 22:00 UTC, indicating a gap of more than a year for that particular metric.

Across the six rows the values are tightly clustered because each pollutant has only one reported figure. The median (and also the minimum and maximum) concentrations are 6.61 µg/m³ for PM1, 9.78 µg/m³ for PM2.5 and 10.37 µg/m³ for PM10. Relative humidity sits at 56.34 % and temperature is a cool 1.39 °C. The particle count measured by UM003 is 927.72 particles per cubic centimetre. Because there is only one observation per pollutant, the inter‑quartile spread (p10 to p90) is zero, so no variability can be inferred from this snapshot.

The dataset therefore offers a complete but very limited picture of air quality in Leeds and the Thousand Islands. While five pollutants are up‑to‑date, the single older PM10 reading highlights uneven temporal coverage. With only one monitoring site contributing all six rows, spatial variation across the city cannot be captured; conditions may differ elsewhere or at other times. Users should keep in mind that this snapshot reflects a specific moment and location rather than a comprehensive, city‑wide trend.

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 five valid measurements and is refreshed regularly, having been updated within the past three days (last update: 2026‑02‑10T22:00:00+00:00). This snapshot provides a current view of air quality for Leeds and the Thousand Islands, but conditions can differ across neighbourhoods and change throughout the day, so local variations may exist.

OpenAQ station rows