What is the air quality trend in Issaquah?

Over the past 17 days, Issaquah had an average AQI of 15 based on station measurements. The worst day was with AQI .

How is Issaquah air quality measured?

Air quality in Issaquah 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 Issaquah, United States

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

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

Current AQI
Good

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

324h · 18 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-11	29	21–34	6.9 µg/m³	7.9	13h	20
2026-04-10	26	13–34	6.1 µg/m³	6.5	24h	20
2026-04-09	20	14–28	4.8 µg/m³	4.7	16h	17
2026-04-08	20	13–29	4.7 µg/m³	5.7	10h	20
2026-04-07	16	10–21	3.8 µg/m³	5.7	24h	20
2026-04-06	25	13–36	5.9 µg/m³	9.3	17h	19
2026-04-04	18	7–25	4.4 µg/m³	4.9	16h	20
2026-04-03	8	5–12	1.8 µg/m³	2.2	24h	8
2026-04-02	7	4–10	1.7 µg/m³	1.1	23h	18
2026-04-01	11	7–15	2.6 µg/m³	2.9	22h	20
2026-03-31	13	6–19	3.1 µg/m³	2.6	23h	19
2026-03-30	16	5–40	3.7 µg/m³	3.0	11h	19
2026-03-29	13	8–18	3.1 µg/m³	2.8	24h	19
2026-03-28	13	8–19	3.1 µg/m³	3.0	23h	20
2026-03-27	14	6–25	3.3 µg/m³	2.4	24h	21
2026-03-26	9	3–17	2.3 µg/m³	1.6	24h	21
2026-03-25	6	3–9	1.5 µg/m³	0.7	6h	18

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