What is the air quality trend in Caledon?

Over the past 5 days, Caledon had an average AQI of 83 based on station measurements. The worst day was 2026-07-17 with AQI 162.

How is Caledon air quality measured?

Air quality in Caledon 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 Caledon, Canada

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

16h

PM2.5 Station

16h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	38	38–38	9.1 µg/m³	1h	1
2026-07-20	41	17–72	11.4 µg/m³	5h	1
2026-07-19	62	27–159	23.1 µg/m³	4h	1
2026-07-18	116	30–183	63.6 µg/m³	4h	1
2026-07-17	162	162–163	77.8 µg/m³	2h	1

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