What is the air quality trend in Ajax?

Over the past 5 days, Ajax had an average AQI of 73 based on station measurements. The worst day was 2026-07-17 with AQI 105.

How is Ajax air quality measured?

Air quality in Ajax 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 Ajax, Canada

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

49h

PM2.5 Station

49h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	100	8–127	35.7 µg/m³	20h	1
2026-07-20	36	1–120	10.7 µg/m³	16h	1
2026-07-19	40	12–164	15.7 µg/m³	7h	1
2026-07-18	88	38–130	29.5 µg/m³	4h	2
2026-07-17	105	101–109	37.1 µg/m³	2h	2

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