What is the air quality trend in Waterdown?

Over the past 15 days, Waterdown had an average AQI of 56 based on station measurements. The worst day was 2026-05-20 with AQI 78.

How is Waterdown air quality measured?

Air quality in Waterdown 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 Waterdown, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

337h

PM2.5 Station

337h · 14 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	45	23–87	12.1 µg/m³	1.9	10h	13
2026-05-29	54	8–122	15.8 µg/m³	12.1	24h	17
2026-05-28	47	19–165	14.6 µg/m³	1.6	24h	16
2026-05-27	59	19–164	18.5 µg/m³	6.1	24h	15
2026-05-26	40	13–102	10.4 µg/m³	6.0	24h	13
2026-05-25	69	20–168	22.6 µg/m³	11.2	24h	16
2026-05-24	44	20–83	12.3 µg/m³	7.1	24h	16
2026-05-23	66	33–134	19.8 µg/m³	2.7	24h	17
2026-05-22	45	13–81	12.3 µg/m³	5.0	24h	15
2026-05-21	77	28–180	26.1 µg/m³	1.6	24h	19
2026-05-20	78	20–182	30.0 µg/m³	7.2	24h	17
2026-05-19	49	16–117	13.8 µg/m³	8.5	24h	15
2026-05-18	52	21–130	14.9 µg/m³	29.4	24h	12
2026-05-17	61	17–134	18.1 µg/m³	27.7	24h	6
2026-05-16	60	25–154	18.2 µg/m³	11.9	15h	16

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