What is the air quality trend in St. Thomas?

Over the past 8 days, St. Thomas had an average AQI of 49 based on station measurements. The worst day was 2026-05-30 with AQI 70.

How is St. Thomas air quality measured?

Air quality in St. Thomas 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 St. Thomas, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

127h

PM2.5 Station

127h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	70	19–240	31.5 µg/m³	13h	2
2026-05-29	39	13–96	10.9 µg/m³	17h	1
2026-05-28	38	15–138	11.2 µg/m³	21h	2
2026-05-27	55	13–170	18.4 µg/m³	20h	2
2026-05-26	51	12–164	15.8 µg/m³	17h	2
2026-05-25	64	13–427	35.2 µg/m³	17h	2
2026-05-24	37	7–113	10.3 µg/m³	19h	2
2026-05-23	39	13–82	11.7 µg/m³	3h	2

Back to St. Thomas Air Quality