What is the air quality trend in Mont-Saint-Hilaire?

Over the past 15 days, Mont-Saint-Hilaire had an average AQI of 28 based on station measurements. The worst day was 2026-10-21 with AQI 48.

How is Mont-Saint-Hilaire air quality measured?

Air quality in Mont-Saint-Hilaire 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 Mont-Saint-Hilaire, Canada

Name: Mont-Saint-Hilaire Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Mont-Saint-Hilaire, Canada.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 22 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	48	48–48	11.5 µg/m³	12.9	1h	22
2026-10-20	30	15–73	7.4 µg/m³	3.1	24h	17
2026-10-19	32	14–60	7.9 µg/m³	2.0	24h	18
2026-10-18	19	7–38	4.6 µg/m³	1.4	24h	14
2026-10-17	28	12–45	6.6 µg/m³	2.5	24h	14
2026-10-16	35	18–125	9.5 µg/m³	5.4	24h	17
2026-10-15	29	16–60	7.1 µg/m³	6.1	24h	20
2026-10-14	40	17–92	10.2 µg/m³	2.7	24h	22
2026-10-13	29	14–65	7.2 µg/m³	2.9	24h	18
2026-10-12	24	14–46	5.7 µg/m³	4.5	24h	19
2026-10-11	30	16–54	7.3 µg/m³	3.9	24h	23
2026-10-10	25	13–54	5.9 µg/m³	3.5	24h	17
2026-10-09	25	15–40	5.9 µg/m³	3.5	24h	15
2026-10-08	28	8–53	6.7 µg/m³	4.9	24h	5
2026-10-07	11	5–29	2.7 µg/m³	1.5	20h	4

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