Air quality in Greater Sudbury, Ontario, Canada today

Mr. Duck’s Air Quality Score

Moderate air today for Greater Sudbury, 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 Greater Sudbury today falls into the Moderate category according to OpenAQ data. The primary pollutant measured is PM2.5 (fine particles), with a reported concentration of 21.47 µg/m³ based on ten valid observations.

No additional pollutants reached measurable levels, and the dataset does not include a PM10 value for this period. This assessment reflects the current snapshot of ambient conditions without interpretation or forecast. 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 Greater Sudbury pulls from two monitoring stations and contains ten recent rows of observations across a suite of pollutants: nitrogen dioxide (NO₂), nitrogen oxides (NOX), ozone (O₃), fine particulate matter (PM₂.5), coarse particulate matter (PM₁), sulfur dioxide (SO₂), relative humidity, and temperature. The most up‑to‑date measurements were recorded on 2026‑02‑10 at 22:00 UTC for NO₂, NOX, O₃, PM₂.5, PM₁, relative humidity and temperature, while the SO₂ reading is slightly older, logged at 20:00 UTC on the same day. All values are therefore fresh within a few hours of the current date.

Across the ten rows, PM₂.5 shows a modest spread, ranging from 13.0 µg/m³ up to 21.47 µg/m³ with a median of about 17.23 µg/m³ and the 10th‑percentile at 13.85 µg/m³ and the 90th‑percentile at 20.62 µg/m³. In contrast, PM₁ is represented by a single reading of roughly 9.33 µg/m³, and humidity and temperature each have one value—47.21 % and 5.41 °C respectively—so no variability can be described for those parameters. The gaseous pollutants are all constant across the sampled rows: NO₂ is recorded at 0.009 ppm, NOX at 0.011 ppm, O₃ at 0.028 ppm, and SO₂ at 0.0 ppm.

Because only two stations contribute data, coverage is uneven: particulate matter has both a range (PM₂.5) and a single point (PM₁), while the gases are identical in every row, indicating limited spatial or temporal variation captured in this snapshot. Users should keep in mind that conditions can differ across neighborhoods and over time, especially given the small number of monitoring points and the uniformity of most pollutant values.

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 dataset for Greater Sudbury includes ten valid measurements and is refreshed regularly, having been updated within three days (last update: 2026‑02‑10 22:00 UTC). These values represent a snapshot of ambient conditions captured by the monitoring network at that time. Air quality can vary across different neighbourhoods and throughout the day, so local conditions may differ from what is shown here.

OpenAQ station rows