Air quality in King, Ontario, Canada today
Mr. Duck’s Air Quality Score
Unhealthy for sensitive groups for King, 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 today in King, Ontario is classified as USG. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 41.39 µg/m³ based on five valid observations reported through OpenAQ.
These values reflect the current assessment for the city without additional interpretation. 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 King, Ontario includes six measured pollutants: PM1, PM10, PM2.5, relative humidity, temperature and UM003 (particle count). All values come from a single monitoring station in Nobleton, so the city‑wide coverage is limited to one row of data per pollutant.
Freshness varies across the series. The most recent readings for PM1, PM2.5, relative humidity, temperature and UM003 were all recorded on 2026-02-10 at 22:00 UTC, meaning they are less than three days old. In contrast, the PM10 measurement is older, last updated on 2025-01-13 at 23:00 UTC, which places it over a year behind the other parameters.
The numeric values show little variation because each pollutant has only one reported figure. PM1 sits at 25.544166660308832 µg/m³, PM10 at 7.102499961853027 µg/m³ and PM2.5 at 41.39233296712239 µg/m³. Relative humidity is recorded as 55.74016660054526 % and temperature as 4.910333410898844 °C, while the particle count (UM003) stands at 3 622.4833333333336 particles/cm³. Because there is a single data point per pollutant, median, minimum and maximum values are identical.
Overall, the dataset provides a snapshot rather than a continuous record for King. The recent timestamps for most pollutants suggest up‑to‑date information is available, but the reliance on one station and the outdated PM10 reading mean that conditions can differ across other neighbourhoods or times not captured here.
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 data set for King, Ontario includes five valid measurements and was refreshed recently, with the latest update recorded on 2026‑02‑10 at 22:00 UTC (Updated within 3 days). These values represent a snapshot of conditions across the monitoring network at that time. Keep in mind that air quality can vary by location and time within the city, so conditions may differ from this brief overview.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Nobleton | pm1 | 25.544166660308832 | µg/m³ | 2026-02-10 22:00 UTC |
| Nobleton | pm10 | 7.102499961853027 | µg/m³ | 2025-01-13 23:00 UTC |
| Nobleton | pm25 | 41.39233296712239 | µg/m³ | 2026-02-10 22:00 UTC |
| Nobleton | relativehumidity | 55.74016660054526 | % | 2026-02-10 22:00 UTC |
| Nobleton | temperature | 4.910333410898844 | c | 2026-02-10 22:00 UTC |
| Nobleton | um003 | 3622.4833333333336 | particles/cm³ | 2026-02-10 22:00 UTC |