What is the air quality trend in Mercier–Hochelaga-Maisonneuve?

Over the past 15 days, Mercier–Hochelaga-Maisonneuve had an average AQI of 22 based on station measurements. The worst day was 2026-10-21 with AQI 152.

How is Mercier–Hochelaga-Maisonneuve air quality measured?

Air quality in Mercier–Hochelaga-Maisonneuve 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 Mercier–Hochelaga-Maisonneuve, Canada

Name: Mercier–Hochelaga-Maisonneuve Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Mercier–Hochelaga-Maisonneuve, Canada.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

299h

PM2.5 Station

299h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	152	152–152	58.2 µg/m³	0.5	1h	2
2026-10-20	16	1–55	4.0 µg/m³	0.2	23h	2
2026-10-19	14	2–25	3.2 µg/m³	0.1	24h	2
2026-10-18	8	1–38	2.0 µg/m³	0.0	23h	2
2026-10-17	4	3–6	1.0 µg/m³	4.0	5h	1
2026-10-16	21	3–51	5.0 µg/m³	0.2	22h	2
2026-10-15	7	1–20	1.8 µg/m³	0.2	20h	2
2026-10-14	12	2–36	2.9 µg/m³	0.1	24h	2
2026-10-13	9	1–35	2.3 µg/m³	1.3	23h	1
2026-10-12	24	4–57	5.9 µg/m³	0.1	24h	2
2026-10-11	20	8–54	4.9 µg/m³	0.1	24h	2
2026-10-10	5	1–22	1.3 µg/m³	0.4	20h	2
2026-10-09	8	1–32	1.7 µg/m³	0.2	21h	1
2026-10-08	31	4–78	7.8 µg/m³	0.1	24h	2
2026-10-07	11	2–52	2.5 µg/m³	0.1	21h	2

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