What is the air quality trend in Walla Walla?

Over the past 15 days, Walla Walla had an average AQI of 22 based on station measurements. The worst day was 2026-10-16 with AQI 37.

How is Walla Walla air quality measured?

Air quality in Walla Walla 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 Walla Walla, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

323h

PM2.5 Station

323h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	34	28–42	8.2 µg/m³	6h	1
2026-10-20	29	19–42	6.9 µg/m³	24h	1
2026-10-19	32	10–59	7.8 µg/m³	23h	1
2026-10-18	16	7–55	3.9 µg/m³	24h	1
2026-10-17	35	15–53	8.5 µg/m³	23h	1
2026-10-16	37	27–47	8.8 µg/m³	17h	1
2026-10-15	27	6–51	6.5 µg/m³	23h	1
2026-10-14	17	8–38	4.2 µg/m³	23h	1
2026-10-13	10	3–24	2.4 µg/m³	24h	1
2026-10-12	13	6–25	3.2 µg/m³	23h	1
2026-10-11	14	5–33	3.3 µg/m³	24h	1
2026-10-10	8	4–13	1.9 µg/m³	24h	1
2026-10-09	21	9–33	5.1 µg/m³	24h	1
2026-10-08	25	19–30	5.9 µg/m³	23h	1
2026-10-07	21	16–32	5.0 µg/m³	18h	1

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