Air quality in Chatham, Ontario, Canada today
Mr. Duck’s Air Quality Score
Moderate air today for Chatham, 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 Chatham today is classified as Moderate. The primary pollutant identified is PM2.5, fine particulate matter, with a measured reference value of 29.0 µg/m³. Data are based on five valid measurements collected through OpenAQ.
Overall conditions reflect the moderate category and the reported PM2.5 concentration. 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 air‑quality feed for Chatham, Ontario draws on eight recent observations collected at a single monitoring site. All five pollutants tracked by the OpenAQ network – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), ozone (O₃) and fine particulate matter (PM2.5) – have data that were last refreshed on 2026‑02‑10 at 22:00 UTC, which falls within the three‑day freshness window noted for each metric.
Across the eight rows, the measured concentrations show a fairly narrow spread for the gases but a broader variation for particulates. NO is recorded at a constant 0.005 ppm in every entry, while NOX sits uniformly at 0.023 ppm and NO₂ ranges from a low of 0.003 ppm to a high of 0.018 ppm, with a median near 0.0105 ppm. Ozone values are clustered tightly between 0.046 ppm and 0.048 ppm, the median being 0.047 ppm. In contrast, PM2.5 exhibits the widest range: the smallest observed value is 1 µg/m³, the largest reaches 29 µg/m³, and the median sits at 15 µg/m³, indicating that particulate levels can differ markedly even within this single location.
Because all eight rows come from one station, spatial coverage across Chatham is limited; conditions elsewhere in the city may not be captured by these data points. Nevertheless, the dataset is recent, with every pollutant’s most current reading dated just a few days ago, providing an up‑to‑date snapshot of air quality at that specific monitoring point.
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 current air‑quality summary for Chatham is based on five valid measurements and was updated within three days, with the latest data recorded at 2026‑02‑10 22:00 UTC. These readings provide a snapshot of conditions across the city, but note that pollutant levels can differ by neighbourhood and change throughout the day, so actual exposure may vary from what is shown here.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Chatham | no2 | 0.003 | ppm | 2023-07-17 18:00 UTC |
| Chatham | o3 | 0.048 | ppm | 2023-07-14 15:00 UTC |
| Chatham | pm25 | 1.0 | µg/m³ | 2023-07-17 18:00 UTC |
| Chatham | no | 0.005 | ppm | 2026-02-10 22:00 UTC |
| Chatham | no2 | 0.018 | ppm | 2026-02-10 22:00 UTC |
| Chatham | nox | 0.023 | ppm | 2026-02-10 22:00 UTC |
| Chatham | o3 | 0.046 | ppm | 2026-02-10 22:00 UTC |
| Chatham | pm25 | 29.0 | µg/m³ | 2026-02-10 22:00 UTC |