What is the air quality trend in Belvidere?

Over the past 20 days, Belvidere had an average AQI of 30 based on station measurements. The worst day was 2026-05-18 with AQI 42.

How is Belvidere air quality measured?

Air quality in Belvidere 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 Belvidere, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

374h

PM2.5 Station

374h · 2 stations

Temperature GFS model

79pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	30	8–53	7.3 µg/m³	15h	2
2026-05-28	28	11–59	6.8 µg/m³	20h	1
2026-05-27	24	7–51	5.7 µg/m³	22h	1
2026-05-26	28	10–58	6.9 µg/m³	15h	1
2026-05-25	27	8–60	6.7 µg/m³	16h	1
2026-05-24	28	14–63	6.9 µg/m³	18h	1
2026-05-23	25	8–49	5.9 µg/m³	20h	1
2026-05-22	23	5–37	5.6 µg/m³	21h	1
2026-05-21	28	15–47	6.7 µg/m³	17h	1
2026-05-20	25	10–55	6.1 µg/m³	19h	2
2026-05-19	34	13–79	8.5 µg/m³	21h	1
2026-05-18	42	9–63	10.6 µg/m³	17h	1
2026-05-17	40	13–61	9.9 µg/m³	16h	1
2026-05-16	37	15–65	9.1 µg/m³	20h	1
2026-05-15	28	11–61	6.9 µg/m³	20h	1
2026-05-14	34	15–61	8.4 µg/m³	21h	1
2026-05-13	35	5–60	8.5 µg/m³	20h	1
2026-05-12	27	10–52	6.5 µg/m³	18h	2
2026-05-11	26	11–38	6.1 µg/m³	19h	1
2026-05-10	37	16–53	8.9 µg/m³	19h	1

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