What is the air quality trend in Hamilton?

Over the past 8 days, Hamilton had an average AQI of 53 based on station measurements. The worst day was 2026-05-23 with AQI 68.

How is Hamilton air quality measured?

Air quality in Hamilton 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 Hamilton, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 13 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	51	28–129	14.5 µg/m³	1.9	9h	11
2026-05-29	56	15–153	17.0 µg/m³	12.1	24h	13
2026-05-28	39	14–97	10.1 µg/m³	1.6	24h	13
2026-05-27	63	18–169	21.1 µg/m³	6.1	24h	13
2026-05-26	45	15–107	12.0 µg/m³	6.0	24h	11
2026-05-25	62	23–155	18.8 µg/m³	11.2	24h	13
2026-05-24	44	20–91	11.7 µg/m³	7.1	24h	13
2026-05-23	68	43–109	20.3 µg/m³	3.1	15h	15

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