What is the air quality trend in Québec?

Over the past 8 days, Québec had an average AQI of 45 based on station measurements. The worst day was 2026-09-05 with AQI 60.

How is Québec air quality measured?

Air quality in Québec is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Québec, Canada

Name: Québec Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Québec, Canada.

139

Current AQI
Unhealthy for sensitive groups Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 48 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	60	22–143	17.6 µg/m³	13h	47
2026-09-04	56	17–118	16.6 µg/m³	24h	48
2026-09-03	49	16–138	13.3 µg/m³	24h	45
2026-09-02	47	22–93	12.5 µg/m³	24h	46
2026-09-01	22	11–77	5.7 µg/m³	23h	47
2026-08-31	48	7–155	16.0 µg/m³	24h	48
2026-08-30	57	18–147	16.9 µg/m³	24h	48
2026-08-29	21	11–27	4.9 µg/m³	9h	50

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