What is the air quality trend in Duluth?

Over the past 8 days, Duluth had an average AQI of 91 based on station measurements. The worst day was 2026-07-17 with AQI 267.

How is Duluth air quality measured?

Air quality in Duluth 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 Duluth, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

157h

PM2.5 Station

157h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	18	15–22	4.4 µg/m³	2h	2
2026-07-21	44	18–67	11.2 µg/m³	24h	3
2026-07-20	74	29–104	23.0 µg/m³	24h	3
2026-07-19	104	60–156	37.0 µg/m³	23h	3
2026-07-18	94	56–173	35.0 µg/m³	23h	3
2026-07-17	267	169–434	219.4 µg/m³	24h	2
2026-07-16	90	20–404	43.3 µg/m³	19h	1
2026-07-15	43	14–69	10.6 µg/m³	18h	1

Back to Duluth Air Quality