What is the air quality trend in Hamilton?

Over the past 15 days, Hamilton had an average AQI of 56 based on station measurements. The worst day was 2026-05-20 with AQI 79.

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

337h

PM2.5 Station

337h · 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	48	28–96	12.8 µg/m³	1.9	10h	13
2026-05-29	56	15–131	16.5 µg/m³	12.1	24h	15
2026-05-28	49	16–166	15.3 µg/m³	1.6	24h	14
2026-05-27	62	20–168	20.5 µg/m³	6.1	24h	13
2026-05-26	38	15–97	9.7 µg/m³	6.0	24h	12
2026-05-25	68	20–175	22.7 µg/m³	11.2	24h	14
2026-05-24	45	21–87	12.5 µg/m³	7.1	24h	15
2026-05-23	66	33–154	19.9 µg/m³	2.7	24h	16
2026-05-22	46	13–88	12.8 µg/m³	5.0	24h	13
2026-05-21	78	28–177	26.4 µg/m³	1.6	24h	17
2026-05-20	79	20–217	33.0 µg/m³	7.2	24h	15
2026-05-19	47	16–128	13.3 µg/m³	8.5	24h	14
2026-05-18	49	22–104	13.4 µg/m³	29.4	24h	11
2026-05-17	61	14–134	18.6 µg/m³	27.7	24h	6
2026-05-16	61	28–153	18.6 µg/m³	11.9	15h	15

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