Air quality in Sarnia, Ontario, Canada today
Mr. Duck’s Air Quality Score
Moderate air today for Sarnia, Ontario, Canada
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Sarnia, Ontario is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 34.0 µg/m³ based on six valid observations collected through OpenAQ.
Overall conditions reflect the Moderate category with PM2.5 as the dominant factor and no reported PM10 value. 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 Sarnia contains a single monitoring row that reports six common air‑quality pollutants: nitrogen monoxide (NO) at 0.002 ppm, nitrogen dioxide (NO₂) at 0.009 ppm, combined nitrogen oxides (NOX) at 0.011 ppm, ozone (O₃) at 0.039 ppm, fine particulate matter (PM2.5) at 34.0 µg/m³, and sulfur dioxide (SO₂) at 0.0 ppm. All six measurements are present, giving a complete picture of the key gases and particles tracked by OpenAQ for this location.
The most recent values for NO, NO₂, NOX and O₃ were all recorded on 2026‑02‑10 at 22:00 UTC, while the PM2.5 reading shares that same timestamp. The SO₂ measurement is slightly older, last updated on 2026‑02‑10 at 06:00 UTC. Because every pollutant’s latest entry falls within a three‑day freshness window, the data can be described as relatively current for this city, though it reflects only one point in time rather than an ongoing series.
Because there is just one reporting station, the range of values for each pollutant is effectively a single figure: the minimum, median and maximum are identical (for example, NO consistently reads 0.002 ppm). This lack of variability means the dataset does not capture temporal fluctuations or spatial differences that may exist across Sarnia. Users should keep in mind that air‑quality conditions can change throughout the day and between neighborhoods, and a single snapshot cannot represent those dynamics.
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 Sarnia reflects six valid measurements and was updated within three days, with the latest refresh recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a current view of ambient 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
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Sarnia | no | 0.002 | ppm | 2026-02-10 22:00 UTC |
| Sarnia | no2 | 0.009 | ppm | 2026-02-10 22:00 UTC |
| Sarnia | nox | 0.011 | ppm | 2026-02-10 22:00 UTC |
| Sarnia | o3 | 0.039 | ppm | 2026-02-10 22:00 UTC |
| Sarnia | pm25 | 34.0 | µg/m³ | 2026-02-10 22:00 UTC |
| Sarnia | so2 | 0.0 | ppm | 2026-02-10 06:00 UTC |