What is the air quality trend in Tacoma?

Over the past 18 days, Tacoma had an average AQI of 15 based on station measurements. The worst day was with AQI .

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
Good

48 Hours 7 Days 14 Days 20 Days

Air Quality Index Trend

359h

PM2.5 Trend

359h · 15 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-12	33	14–54	8.0 µg/m³	11.0	24h	18
2026-04-11	24	12–35	5.7 µg/m³	7.7	24h	17
2026-04-10	26	14–35	6.1 µg/m³	7.4	24h	17
2026-04-09	20	14–27	4.8 µg/m³	5.2	16h	14
2026-04-08	19	12–28	4.6 µg/m³	5.6	10h	17
2026-04-07	14	10–20	3.5 µg/m³	5.0	24h	18
2026-04-06	24	12–35	5.8 µg/m³	8.4	17h	17
2026-04-04	18	5–25	4.3 µg/m³	4.0	16h	17
2026-04-03	7	5–12	1.8 µg/m³	2.1	24h	8
2026-04-02	7	4–10	1.6 µg/m³	1.1	23h	15
2026-04-01	10	7–13	2.5 µg/m³	2.8	22h	17
2026-03-31	12	5–18	2.9 µg/m³	2.3	23h	17
2026-03-30	15	5–40	3.6 µg/m³	2.8	11h	16
2026-03-29	13	9–19	3.1 µg/m³	2.9	24h	17
2026-03-28	13	7–19	3.1 µg/m³	3.0	23h	18
2026-03-27	13	5–20	3.1 µg/m³	2.0	24h	19
2026-03-26	8	2–15	1.9 µg/m³	1.6	24h	18
2026-03-25	6	2–9	1.3 µg/m³	0.7	6h	16

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