Air quality in Yellowknife, Northwest Territories, Canada today

Mr. Duck’s Air Quality Score

Good air today for Yellowknife, Northwest Territories, 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 Yellowknife today is classified as Good. The primary pollutant measured is PM2.5, with a recorded concentration of 0.38 µg/m³ based on eight valid observations from OpenAQ data.

Overall conditions reflect low particulate levels, and the available measurements do not indicate any additional pollutants of concern. 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 Yellowknife air‑quality feed pulls data from three monitoring sites that together contribute 17 recent rows of observations. Five of the measured variables – PM1, PM2.5, relative humidity, temperature and particle count (UM003) – have been updated within the last three days, with their most recent timestamps recorded on 2026‑02‑10 at 22:00 UTC. The sixth variable, PM10, is only available from an older record dated 2025‑01‑13 at 23:00 UTC, so its coverage is less current than the others.

Across the fresh data set, concentrations of fine particles show a wide spread. PM1 values range from essentially zero up to about 3.44 µg/m³, with a median near 0.03 µg/m³ and the 90th percentile at roughly 2.76 µg/m³, indicating that most recent readings are low but occasional higher spikes occur. PM2.5 follows a similar pattern, varying between 0 and just over 6 µg/m³; the median is 0.38 µg/m³ while the 90th percentile sits near 4.92 µg/m³. By contrast, the older PM10 measurement stays within a narrow band of roughly 6.41 to 7.95 µg/m³, with its median at 7.18 µg/m³, reflecting limited recent insight into larger particulate trends.

The atmospheric conditions recorded alongside the pollutants also display notable ranges. Relative humidity has been observed from about 42 % up to 72 %, with a typical value around 44 %. Temperatures are consistently below freezing, spanning –11.4 °C to –6.68 °C and centering near –10.5 °C. Particle counts (UM003) show the greatest variability, ranging from roughly 25 to 584 particles per cubic centimetre; the median count is about 111, while the 90th percentile exceeds 489, suggesting occasional periods of markedly higher aerosol presence. Overall, while most variables provide recent and fairly detailed snapshots of Yellowknife’s air quality, the older PM10 data means that assessments of larger particulate matter rely on less current information, and conditions can differ across locations and times within the city.

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 dataset for Yellowknife includes eight valid measurements and was updated within 3 days, with the latest refresh recorded at 2026‑02‑10T22:00:00+00:00. These values represent a snapshot of conditions across the city; actual air quality can differ by specific location and time of day, so individual experiences may vary from what is shown here.

OpenAQ station rows