What is the air quality trend in Saint-Jérôme?

Over the past 15 days, Saint-Jérôme had an average AQI of 28 based on station measurements. The worst day was 2026-10-21 with AQI 45.

How is Saint-Jérôme air quality measured?

Air quality in Saint-Jérôme 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 Saint-Jérôme, Canada

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 21 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	45	45–45	10.8 µg/m³	13.7	1h	21
2026-10-20	30	15–71	7.5 µg/m³	2.9	24h	17
2026-10-19	34	14–63	8.6 µg/m³	2.6	24h	18
2026-10-18	20	7–48	4.7 µg/m³	1.5	24h	15
2026-10-17	28	15–48	6.8 µg/m³	2.8	24h	14
2026-10-16	35	18–113	9.5 µg/m³	4.7	24h	18
2026-10-15	29	16–57	7.1 µg/m³	3.0	24h	21
2026-10-14	40	18–88	10.2 µg/m³	2.5	24h	23
2026-10-13	29	13–63	7.2 µg/m³	3.0	24h	19
2026-10-12	24	13–44	5.8 µg/m³	6.1	24h	19
2026-10-11	30	18–53	7.2 µg/m³	4.1	24h	25
2026-10-10	25	13–45	6.0 µg/m³	2.5	24h	18
2026-10-09	26	10–49	6.1 µg/m³	2.1	24h	15
2026-10-08	26	4–54	6.4 µg/m³	4.7	24h	4
2026-10-07	10	3–35	2.4 µg/m³	2.2	21h	3

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