What is the air quality trend in Northfield?

Over the past 8 days, Northfield had an average AQI of 78 based on station measurements. The worst day was 2026-07-16 with AQI 145.

How is Northfield air quality measured?

Air quality in Northfield 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 Northfield, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

111h

PM2.5 Station

111h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	42	11–62	11.1 µg/m³	6h	1
2026-07-21	49	19–67	13.1 µg/m³	11h	1
2026-07-20	74	48–121	22.9 µg/m³	13h	1
2026-07-19	94	40–176	35.4 µg/m³	13h	1
2026-07-18	61	35–152	17.1 µg/m³	13h	1
2026-07-17	120	29–497	75.3 µg/m³	21h	1
2026-07-16	145	31–500	114.9 µg/m³	22h	1
2026-07-15	39	15–77	9.8 µg/m³	12h	1

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