What is the air quality trend in Lewiston?

Over the past 15 days, Lewiston had an average AQI of 23 based on station measurements. The worst day was 2026-05-27 with AQI 40.

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.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

325h

PM2.5 Station

325h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	26	14–55	6.2 µg/m³	16h	3
2026-05-28	24	15–47	5.8 µg/m³	22h	3
2026-05-27	40	12–297	16.9 µg/m³	24h	4
2026-05-26	20	10–47	4.7 µg/m³	24h	4
2026-05-25	26	11–52	6.1 µg/m³	24h	3
2026-05-24	22	10–39	5.3 µg/m³	24h	4
2026-05-23	18	5–38	4.4 µg/m³	24h	3
2026-05-22	25	13–52	6.1 µg/m³	24h	3
2026-05-21	19	6–30	4.5 µg/m³	24h	3
2026-05-20	25	6–66	6.1 µg/m³	24h	3
2026-05-19	27	8–61	6.7 µg/m³	24h	3
2026-05-18	23	4–52	5.5 µg/m³	23h	3
2026-05-17	18	5–54	4.4 µg/m³	21h	3
2026-05-16	20	9–36	4.8 µg/m³	20h	3
2026-05-15	22	14–30	5.4 µg/m³	7h	3

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