What is the air quality trend in Greenfield?

Over the past 3 days, Greenfield had an average AQI of 21 based on station measurements. The worst day was 2026-10-21 with AQI 24.

How is Greenfield air quality measured?

Air quality in Greenfield 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 Greenfield, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

45h

PM2.5 Station

45h · 1 station

Temperature GFS model

7pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	24	16–43	5.9 µg/m³	4h	2
2026-10-20	21	12–38	5.1 µg/m³	24h	2
2026-10-19	18	10–28	4.2 µg/m³	17h	2

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