Air quality in Barrie, Ontario, Canada today

Mr. Duck’s Air Quality Score

Moderate air today for Barrie, 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 Barrie today falls into the Moderate category. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 18.0 µg/m³, based on five valid observations reported through OpenAQ.

Overall conditions reflect the moderate rating with the noted fine particle 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 Barrie air‑quality dataset contains eight measured variables collected from a total of two monitoring rows. The most recent observations for the five key gases—NO, NO₂, NOX, O₃ and PM2.5—were all recorded on 2026‑02‑10 at 22:00 UTC, so the freshest data are less than three days old. In contrast, the particulate matter size fraction PM1, as well as relative humidity and temperature, come from a single older record dated 2025‑10‑15 at 16:00 UTC, indicating that coverage for these parameters is limited to one historic snapshot.

For the gases with recent updates, the recorded values span modest ranges. NO varies between 0.001 ppm and a maximum of 0.002 ppm, while NO₂ runs from 0.002 ppm up to 0.015 ppm; the median concentrations are 0.0015 ppm for NO and 0.0085 ppm for NO₂. NOX shows a similar spread, from 0.003 ppm to 0.018 ppm with a median of about 0.0105 ppm. Ozone levels are tightly clustered between 0.025 ppm and 0.033 ppm, median 0.029 ppm. PM2.5 exhibits the widest variation among the recent data, ranging from essentially zero to 18 µg/m³, with a median of 4 µg/m³ and a 90th‑percentile value of 15.2 µg/m³.

Because only two rows contribute to the dataset, the spatial representation is sparse; conditions can differ across neighborhoods and times that are not captured here. The older PM1, humidity and temperature readings provide a single point of reference (0 µg/m³ for PM1, 35.76 % relative humidity, and 23.70 °C), but they do not reflect current variability. Overall, the dataset offers fresh information for several key pollutants while showing limited breadth in both station count and temporal coverage for some parameters.

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 updated within three 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 Barrie, but conditions can differ by specific location and time of day within the city, so values may not represent every neighborhood or moment.

OpenAQ station rows