What is the air quality trend in Algonquin?

Over the past 8 days, Algonquin had an average AQI of 31 based on station measurements. The worst day was 2026-10-21 with AQI 55.

How is Algonquin air quality measured?

Air quality in Algonquin 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 Algonquin, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Algonquin, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 122 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	55	53–57	13.9 µg/m³	1.0	2h	124
2026-10-20	52	22–72	13.7 µg/m³	—	24h	110
2026-10-19	28	21–42	6.7 µg/m³	—	24h	126
2026-10-18	24	18–37	5.7 µg/m³	—	24h	116
2026-10-17	16	13–24	3.9 µg/m³	—	24h	124
2026-10-16	19	11–44	4.7 µg/m³	—	24h	120
2026-10-15	24	15–40	5.8 µg/m³	—	24h	126
2026-10-14	35	19–51	8.4 µg/m³	1.2	19h	126

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