What is the air quality trend in Lewiston?

Over the past 7 days, Lewiston had an average AQI of 94 based on station measurements. The worst day was 2026-08-07 with AQI 157.

How is Lewiston air quality measured?

Air quality in Lewiston 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 Lewiston, United States

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

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

154

Current AQI
Unhealthy Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

96h

PM2.5 Station

96h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-07	157	151–163	66.3 µg/m³	18h	1
2026-08-06	94	74–128	32.3 µg/m³	18h	1
2026-08-05	102	82–121	35.7 µg/m³	10h	1
2026-08-04	134	93–159	50.1 µg/m³	19h	1
2026-08-03	36	13–80	9.7 µg/m³	11h	1
2026-08-02	54	26–98	15.3 µg/m³	13h	1
2026-08-01	84	66–112	27.5 µg/m³	7h	1

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