What is the air quality trend in Forest Grove?

Over the past 3 days, Forest Grove had an average AQI of 28 based on station measurements. The worst day was 2026-07-21 with AQI 46.

How is Forest Grove air quality measured?

Air quality in Forest Grove 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 Forest Grove, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

49h

PM2.5 Station

49h · 2 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	46	24–84	12.0 µg/m³	24h	12
2026-07-20	24	14–46	5.6 µg/m³	24h	15
2026-07-19	16	16–16	3.9 µg/m³	1h	3

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