What is the air quality trend in Tacoma?

Over the past 8 days, Tacoma had an average AQI of 54 based on station measurements. The worst day was 2026-08-06 with AQI 115.

How is Tacoma air quality measured?

Air quality in Tacoma 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 Tacoma, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

158h

PM2.5 Station

158h · 5 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	50	31–71	13.2 µg/m³	10h	5
2026-08-07	74	55–126	23.0 µg/m³	20h	5
2026-08-06	115	60–153	40.8 µg/m³	24h	5
2026-08-05	107	72–153	37.9 µg/m³	24h	5
2026-08-04	54	32–97	14.9 µg/m³	24h	6
2026-08-03	18	7–31	4.4 µg/m³	18h	6
2026-08-02	13	5–20	3.1 µg/m³	24h	5
2026-08-01	4	1–10	1.0 µg/m³	14h	5

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