What is the air quality trend in Sydney?

Over the past 11 days, Sydney had an average AQI of 42 based on station measurements. The worst day was 2026-07-17 with AQI 59.

How is Sydney air quality measured?

Air quality in Sydney 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 Sydney, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

97h

PM2.5 Station

97h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	41	12–182	13.9 µg/m³	19h	1
2026-07-20	57	14–155	17.5 µg/m³	19h	2
2026-07-19	39	5–82	10.1 µg/m³	14h	2
2026-07-18	47	2–193	18.5 µg/m³	13h	1
2026-07-17	59	20–138	18.0 µg/m³	5h	1
2026-07-16	33	13–65	8.7 µg/m³	4h	1
2026-07-15	51	23–83	14.2 µg/m³	9h	1
2026-07-14	42	42–42	10.1 µg/m³	1h	1
2026-07-11	14	12–16	3.4 µg/m³	2h	1
2026-07-09	46	13–93	13.5 µg/m³	5h	1
2026-07-08	36	6–55	8.9 µg/m³	6h	1

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