What is the air quality trend in Naperville?

Over the past 8 days, Naperville had an average AQI of 31 based on station measurements. The worst day was 2026-10-20 with AQI 51.

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
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 276 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	51	18–71	13.6 µg/m³	1.0	19h	232
2026-10-19	28	21–41	6.7 µg/m³	3.4	24h	274
2026-10-18	22	18–35	5.4 µg/m³	—	24h	251
2026-10-17	16	13–23	3.9 µg/m³	4.5	24h	273
2026-10-16	19	10–39	4.5 µg/m³	1.1	24h	262
2026-10-15	24	14–40	5.7 µg/m³	1.6	24h	273
2026-10-14	39	18–54	9.4 µg/m³	2.4	24h	273
2026-10-13	49	49–50	11.9 µg/m³	1.1	3h	275

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