What is the air quality trend in Ancaster?

Over the past 15 days, Ancaster had an average AQI of 54 based on station measurements. The worst day was 2026-05-21 with AQI 85.

How is Ancaster air quality measured?

Air quality in Ancaster 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 Ancaster, Canada

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

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

Current AQI
Good Station

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	43	28–93	11.6 µg/m³	2.6	9h	11
2026-05-29	51	10–124	14.9 µg/m³	7.4	24h	12
2026-05-28	34	11–97	8.7 µg/m³	2.1	24h	12
2026-05-27	59	17–147	17.7 µg/m³	5.7	24h	12
2026-05-26	40	13–109	10.5 µg/m³	5.8	24h	11
2026-05-25	60	20–154	17.8 µg/m³	11.2	24h	13
2026-05-24	40	18–77	10.6 µg/m³	5.1	24h	13
2026-05-23	60	20–107	17.4 µg/m³	3.1	24h	14
2026-05-22	40	15–85	10.8 µg/m³	4.0	24h	11
2026-05-21	85	25–179	30.3 µg/m³	1.9	24h	14
2026-05-20	79	14–218	32.8 µg/m³	5.9	24h	11
2026-05-19	49	22–117	13.8 µg/m³	7.7	24h	11
2026-05-18	60	28–121	17.3 µg/m³	23.5	24h	10
2026-05-17	61	19–104	18.1 µg/m³	25.0	24h	5
2026-05-16	55	28–156	16.1 µg/m³	12.0	15h	13

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