What is the air quality trend in Tigard?

Over the past 14 days, Tigard had an average AQI of 14 based on station measurements. The worst day was 2026-07-21 with AQI 38.

How is Tigard air quality measured?

Air quality in Tigard 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 Tigard, United States

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

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

105

Current AQI
Unhealthy for sensitive groups Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

307h

PM2.5 Station

307h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	38	20–63	9.5 µg/m³	22h	2
2026-07-20	20	12–30	4.9 µg/m³	24h	2
2026-07-19	16	11–23	3.9 µg/m³	24h	2
2026-07-18	14	8–23	3.4 µg/m³	24h	2
2026-07-17	22	10–40	5.3 µg/m³	24h	2
2026-07-16	20	10–30	4.9 µg/m³	20h	2
2026-07-15	15	6–24	3.6 µg/m³	24h	2
2026-07-14	10	2–18	2.5 µg/m³	24h	2
2026-07-13	9	2–19	2.2 µg/m³	24h	3
2026-07-12	6	2–11	1.4 µg/m³	24h	3
2026-07-11	7	2–12	1.7 µg/m³	24h	3
2026-07-10	11	5–18	2.6 µg/m³	24h	3
2026-07-09	10	6–15	2.5 µg/m³	14h	3
2026-07-08	7	3–14	1.5 µg/m³	11h	3

Back to Tigard Air Quality