What is the air quality trend in Richmond Hill?

Over the past 7 days, Richmond Hill had an average AQI of 74 based on station measurements. The worst day was 2026-07-18 with AQI 110.

How is Richmond Hill air quality measured?

Air quality in Richmond Hill 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 Richmond Hill, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

108h

PM2.5 Station

108h · 5 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-21	88	8–127	30.8 µg/m³	41.9	24h	1
2026-07-20	36	1–120	10.7 µg/m³	14.3	16h	1
2026-07-19	42	12–161	15.2 µg/m³	4.4	7h	3
2026-07-18	110	31–177	53.2 µg/m³	—	4h	5
2026-07-17	75	1–121	25.1 µg/m³	30.0	15h	1
2026-07-16	107	71–151	37.5 µg/m³	45.6	24h	1
2026-07-15	66	11–114	21.8 µg/m³	24.8	18h	1

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