What is the air quality trend in Thorold?

Over the past 15 days, Thorold had an average AQI of 44 based on station measurements. The worst day was 2026-05-27 with AQI 64.

How is Thorold air quality measured?

Air quality in Thorold 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 Thorold, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 4 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	38	15–60	9.7 µg/m³	6h	5
2026-05-29	33	15–64	8.2 µg/m³	24h	6
2026-05-28	34	12–75	8.4 µg/m³	24h	6
2026-05-27	64	21–239	24.0 µg/m³	24h	7
2026-05-26	39	9–92	10.6 µg/m³	24h	6
2026-05-25	42	14–152	11.6 µg/m³	24h	6
2026-05-24	35	10–112	9.8 µg/m³	23h	6
2026-05-23	56	18–125	16.6 µg/m³	24h	7
2026-05-22	34	11–81	8.9 µg/m³	24h	6
2026-05-21	59	13–160	19.1 µg/m³	24h	7
2026-05-20	46	13–101	12.7 µg/m³	24h	6
2026-05-19	53	17–145	14.7 µg/m³	24h	6
2026-05-18	51	18–123	14.0 µg/m³	24h	6
2026-05-17	33	6–70	8.2 µg/m³	24h	4
2026-05-16	47	22–163	14.3 µg/m³	16h	7

Back to Thorold Air Quality