What is the air quality trend in Fitchburg?

Over the past 8 days, Fitchburg had an average AQI of 104 based on station measurements. The worst day was 2026-07-17 with AQI 196.

How is Fitchburg air quality measured?

Air quality in Fitchburg 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 Fitchburg, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

40h

PM2.5 Station

40h · 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	35	31–42	8.4 µg/m³	3h	2
2026-07-21	37	29–56	9.1 µg/m³	4h	1
2026-07-20	108	72–130	38.2 µg/m³	6h	2
2026-07-19	188	159–219	121.5 µg/m³	4h	2
2026-07-18	58	20–91	17.5 µg/m³	8h	2
2026-07-17	196	169–251	131.7 µg/m³	4h	2
2026-07-16	174	170–179	99.6 µg/m³	4h	2
2026-07-15	38	31–44	9.1 µg/m³	7h	2

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