What is the air quality trend in Caledon?

Over the past 15 days, Caledon had an average AQI of 51 based on station measurements. The worst day was 2026-05-20 with AQI 78.

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

336h

PM2.5 Station

336h · 12 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-30	42	17–97	11.5 µg/m³	2.3	13h	13
2026-05-29	48	10–98	13.3 µg/m³	7.4	24h	17
2026-05-28	37	13–144	10.1 µg/m³	2.1	24h	15
2026-05-27	54	21–161	16.1 µg/m³	5.7	24h	15
2026-05-26	41	20–87	10.6 µg/m³	5.8	24h	13
2026-05-25	63	20–166	19.8 µg/m³	11.2	24h	15
2026-05-24	50	12–134	13.8 µg/m³	5.1	24h	17
2026-05-23	54	26–86	14.7 µg/m³	3.1	24h	18
2026-05-22	44	11–87	11.7 µg/m³	4.0	24h	14
2026-05-21	52	20–97	14.1 µg/m³	1.9	24h	17
2026-05-20	78	19–184	28.4 µg/m³	5.9	24h	15
2026-05-19	46	23–87	12.4 µg/m³	7.7	24h	14
2026-05-18	55	27–161	15.9 µg/m³	23.5	24h	12
2026-05-17	59	21–151	17.2 µg/m³	25.0	24h	7
2026-05-16	46	28–81	11.8 µg/m³	13.8	11h	16

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