What is the air quality trend in Northbrook?

Over the past 7 days, Northbrook had an average AQI of 8 based on station measurements. The worst day was 2026-08-05 with AQI 13.

How is Northbrook air quality measured?

Air quality in Northbrook 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 Northbrook, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

91h

PM2.5 Station

91h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-07	8	2–18	1.9 µg/m³	2.3	9h	1
2026-08-06	10	4–25	2.5 µg/m³	2.8	16h	1
2026-08-05	13	2–37	3.2 µg/m³	3.6	14h	1
2026-08-04	12	3–23	2.6 µg/m³	2.9	12h	1
2026-08-03	3	2–4	0.8 µg/m³	1.3	2h	1
2026-08-02	8	4–15	1.8 µg/m³	2.1	22h	2
2026-08-01	7	1–13	1.5 µg/m³	1.9	16h	2

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