What is the air quality trend in Chatham?

Over the past 4 days, Chatham had an average AQI of 144 based on station measurements. The worst day was 2026-07-17 with AQI 320.

How is Chatham air quality measured?

Air quality in Chatham 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 Chatham, Canada

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

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

Current AQI
Moderate 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	87	68–119	28.9 µg/m³	6h	1
2026-07-19	126	99–144	45.7 µg/m³	4h	1
2026-07-18	46	38–55	11.3 µg/m³	4h	1
2026-07-17	320	295–344	274.9 µg/m³	2h	1

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