What is the air quality trend in Caledon?

Over the past 8 days, Caledon had an average AQI of 42 based on station measurements. The worst day was 2026-05-25 with AQI 61.

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

168h

PM2.5 Station

168h · 10 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-30	37	22–71	9.2 µg/m³	2.6	11h	11
2026-05-29	42	10–92	11.6 µg/m³	7.4	24h	16
2026-05-28	33	12–83	8.3 µg/m³	2.1	24h	14
2026-05-27	47	15–163	14.2 µg/m³	5.7	24h	12
2026-05-26	35	16–63	8.7 µg/m³	5.8	24h	11
2026-05-25	61	23–164	18.8 µg/m³	11.2	24h	14
2026-05-24	47	21–124	12.8 µg/m³	5.1	24h	15
2026-05-23	39	14–91	10.6 µg/m³	2.6	13h	12

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