What is the air quality trend in Marshfield?

Over the past 8 days, Marshfield had an average AQI of 121 based on station measurements. The worst day was 2026-07-16 with AQI 253.

How is Marshfield air quality measured?

Air quality in Marshfield 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 Marshfield, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

141h

PM2.5 Station

141h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	40	18–65	10.2 µg/m³	18h	2
2026-07-20	138	19–186	77.8 µg/m³	22h	2
2026-07-19	190	154–218	129.1 µg/m³	20h	2
2026-07-18	63	13–151	20.0 µg/m³	24h	2
2026-07-17	169	42–248	114.7 µg/m³	20h	2
2026-07-16	253	205–308	203.3 µg/m³	14h	2
2026-07-15	84	30–256	45.6 µg/m³	20h	2
2026-07-14	33	32–35	7.9 µg/m³	3h	2

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