What is the air quality trend in Welland?

Over the past 4 days, Welland had an average AQI of 100 based on station measurements. The worst day was 2026-07-17 with AQI 175.

How is Welland air quality measured?

Air quality in Welland 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 Welland, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

16h

PM2.5 Station

16h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-20	44	25–82	12.0 µg/m³	6h	1
2026-07-19	70	28–149	22.8 µg/m³	4h	1
2026-07-18	114	34–187	54.4 µg/m³	4h	1
2026-07-17	175	162–188	102.0 µg/m³	2h	1

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