Air quality in City of Saint John, New Brunswick, Canada today
Mr. Duck’s Air Quality Score
Good air today for City of Saint John, New Brunswick, 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 Saint John, New Brunswick is classified as Good today. The primary pollutant measured is PM2.5, with a reported concentration of 5.2 µg/m³ based on three valid observations from OpenAQ data.
Overall conditions meet the criteria for a Good rating, and no additional pollutants reached reporting thresholds. 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 Saint John pulls in three separate pollutant measurements from a single monitoring location, giving a total of three data rows. All three pollutants – nitrogen dioxide (NO2), ozone (O3) and fine particulate matter (PM2.5) – are reported with the same timestamp of 2026-02-10 22:00 UTC, which falls within the last three days and therefore represents very recent information for the city.
The values themselves show no variation across the recorded period because each pollutant has only one reading. NO2 is listed at 0.0081 ppm, O3 at 0.0300 ppm and PM2.5 at 5.2 µg/m³. Because there is a single observation per pollutant, the minimum, median, maximum, as well as the 10th‑percentile and 90th‑percentile all match that same figure. This means the dataset does not provide a range or spread for any of the three substances; it simply reflects the conditions at the Forest Hills site at the moment of capture.
Since the data comes from only one station, spatial coverage across Saint John is limited. Conditions measured at Forest Hills may differ from those in other neighbourhoods, especially where traffic density, industrial activity or local micro‑climates vary. The freshness of the timestamps indicates that the information is up to date, but the lack of multiple stations or repeated measurements means the dataset cannot describe how pollutant levels change over time or across the broader city area. Users should keep in mind that while the current snapshot is recent, a fuller picture of Saint John’s air quality would require additional monitoring sites and more frequent sampling.
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 three valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 22:00 UTC. This snapshot provides a current view of air quality across Saint John, but conditions can differ by specific neighbourhoods and times of day, so local variations may exist.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| FOREST HILLS | no2 | 0.0081 | ppm | 2026-02-10 22:00 UTC |
| FOREST HILLS | o3 | 0.03 | ppm | 2026-02-10 22:00 UTC |
| FOREST HILLS | pm25 | 5.2 | µg/m³ | 2026-02-10 22:00 UTC |