Air quality in Newmarket, Ontario, Canada today
Mr. Duck’s Air Quality Score
Moderate air today for Newmarket, 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 Newmarket, Ontario is currently classified as Moderate. The primary pollutant identified for today is PM2.5 (fine particles).
Measurements from five valid sampling points show a PM2.5 concentration of 21.0 µg/m³. No PM10 value is available for this assessment. 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 Newmarket includes five measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO2), total nitrogen oxides (NOX), ozone (O3) and fine particulate matter (PM2.5). All values come from a single monitoring station, so the city’s air‑quality picture is based on one location rather than a network of sites.
Each pollutant has a single recorded value that is both the minimum, median and maximum for the period covered. NO registers at 0.003 ppm, NO2 at 0.018 ppm, NOX at 0.022 ppm and O3 at 0.029 ppm. The PM2.5 concentration is 21.0 µg/m³. Because there is no variation among the recorded points, the data set does not show any spread or range for these measurements.
The most recent timestamp for every pollutant is 2026‑02‑10 22:00 UTC, which falls within a three‑day freshness window relative to today (2026‑02‑12). This indicates that the information is up‑to‑date, but the limited number of rows – one per pollutant from a single site – means the snapshot may not capture spatial differences across Newmarket. Consequently, while the figures are current, they represent only one point in the city and conditions can differ elsewhere or at other times.
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 was updated within 3 days, with the most recent reading recorded at 2026‑02‑10T22:00:00+00:00. These values provide a snapshot of current conditions in Newmarket, Ontario, but air quality can vary by location and time within the city, so actual exposure may differ from what is displayed here.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Newmarket | no | 0.003 | ppm | 2026-02-10 22:00 UTC |
| Newmarket | no2 | 0.018 | ppm | 2026-02-10 22:00 UTC |
| Newmarket | nox | 0.022 | ppm | 2026-02-10 22:00 UTC |
| Newmarket | o3 | 0.029 | ppm | 2026-02-10 22:00 UTC |
| Newmarket | pm25 | 21.0 | µg/m³ | 2026-02-10 22:00 UTC |