Air quality in Quebec, Quebec, Canada today

Mr. Duck’s Air Quality Score

Moderate air today for Quebec, Quebec, 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 Quebec today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).

Measurements show a PM2.5 concentration of 23.2 µg/m³ based on 13 valid observations reported through OpenAQ. 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 Quebec includes seven measured variables: PM2.5, O3, NO2, PM1, relative humidity, temperature and UM003 (particle concentration). It is drawn from 14 rows of sensor data representing five distinct monitoring stations. The most recent observations are from 2026‑02‑10 22:00 UTC for PM2.5, O3, PM1, relative humidity, temperature and UM003, while the NO2 reading dates back to 2021‑09‑16 18:00 UTC, making it the only older value in the set.

Across the recent data the median PM2.5 concentration is 15.5 µg/m³, with values ranging from a low of 4.69 µg/m³ up to 23.2 µg/m³; the 10th and 90th percentiles sit at roughly 6.1 µg/m³ and 21.0 µg/m³ respectively, indicating a moderate spread around the median. Ozone levels are tightly clustered, with a median of 0.0245 ppm and a narrow range between 0.020 ppm and 0.028 ppm. In contrast, the single NO2 measurement is constant at 0.001 ppm, reflecting the lack of recent updates for this pollutant.

The ancillary variables show little variation because each comes from a single recent reading: PM1 is recorded at 1.1668 µg/m³, relative humidity at 33.96 %, temperature at 2.82 °C and UM003 at 264.52 particles/cm³, all measured at the Vieux‑Limoilou site on the same timestamp. Because most pollutants are represented by only one or a few recent rows, the coverage is uneven—five stations provide fresh data for six variables, but NO2 relies on an older record from a different location. Consequently, while the snapshot gives a clear picture of current PM2.5 and ozone conditions in parts of Quebec, it does not capture city‑wide variability over time, especially for nitrogen dioxide.

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 reflect 13 valid measurements and were updated within 3 days, with the latest update recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a current view of air quality across Quebec but conditions can differ by specific neighbourhoods and times of day, so local variations may not be captured in these figures.

OpenAQ station rows