What is the air quality trend in Naperville?

Over the past 8 days, Naperville had an average AQI of 103 based on station measurements. The worst day was 2026-07-17 with AQI 233.

How is Naperville air quality measured?

Air quality in Naperville 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 Naperville, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 8 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	65	32–98	19.4 µg/m³	21h	239
2026-07-20	99	59–107	34.6 µg/m³	24h	243
2026-07-19	112	63–161	40.9 µg/m³	24h	254
2026-07-18	49	26–89	12.8 µg/m³	24h	254
2026-07-17	233	68–360	179.3 µg/m³	24h	267
2026-07-16	154	51–329	101.1 µg/m³	24h	247
2026-07-15	52	49–59	12.8 µg/m³	24h	258
2026-07-14	60	59–60	16.3 µg/m³	3h	269

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