What is the air quality trend in Spokane?

Over the past 21 days, Spokane had an average AQI of 41 based on station measurements. The worst day was 2026-08-22 with AQI 70.

How is Spokane air quality measured?

Air quality in Spokane 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 Spokane, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

479h

PM2.5 Station

479h · 17 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	16	5–23	3.9 µg/m³	20h	16
2026-09-04	10	8–14	2.5 µg/m³	24h	17
2026-09-03	11	4–30	2.6 µg/m³	24h	17
2026-09-02	36	13–57	9.1 µg/m³	24h	16
2026-09-01	34	15–57	8.2 µg/m³	24h	14
2026-08-31	27	18–38	6.6 µg/m³	24h	17
2026-08-30	34	19–52	8.1 µg/m³	24h	17
2026-08-29	22	11–38	5.4 µg/m³	24h	17
2026-08-28	51	16–108	14.8 µg/m³	24h	17
2026-08-27	55	32–98	14.7 µg/m³	24h	17
2026-08-26	49	29–58	12.5 µg/m³	24h	17
2026-08-25	39	27–46	9.3 µg/m³	24h	17
2026-08-24	55	49–61	13.9 µg/m³	24h	17
2026-08-23	30	16–54	7.3 µg/m³	24h	17
2026-08-22	70	25–93	21.8 µg/m³	24h	17
2026-08-21	62	55–69	17.5 µg/m³	24h	17
2026-08-20	64	54–75	18.1 µg/m³	24h	14
2026-08-19	59	53–71	15.9 µg/m³	24h	17
2026-08-18	61	48–76	16.7 µg/m³	23h	16
2026-08-17	52	35–58	13.1 µg/m³	24h	17
2026-08-16	43	28–56	10.6 µg/m³	4h	17

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