What is the air quality trend in Northfield?

Over the past 14 days, Northfield had an average AQI of 50 based on station measurements. The worst day was 2026-07-16 with AQI 83.

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
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

241h

PM2.5 Station

241h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	52	15–73	14.6 µg/m³	13h	1
2026-07-20	80	40–137	26.0 µg/m³	11h	1
2026-07-19	64	27–124	19.6 µg/m³	14h	1
2026-07-18	61	18–169	21.8 µg/m³	14h	1
2026-07-17	76	15–275	36.5 µg/m³	19h	1
2026-07-16	83	13–328	42.6 µg/m³	17h	1
2026-07-15	48	22–139	12.6 µg/m³	18h	1
2026-07-14	37	19–56	8.9 µg/m³	19h	1
2026-07-13	34	23–47	8.2 µg/m³	18h	1
2026-07-12	35	18–52	8.5 µg/m³	17h	1
2026-07-11	36	16–51	8.6 µg/m³	21h	1
2026-07-10	35	23–62	8.6 µg/m³	19h	1
2026-07-09	35	18–56	8.5 µg/m³	21h	1
2026-07-08	33	14–61	8.0 µg/m³	20h	1

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