What is the air quality trend in Hillsboro?

Over the past 14 days, Hillsboro had an average AQI of 22 based on station measurements. The worst day was 2026-07-21 with AQI 46.

How is Hillsboro air quality measured?

Air quality in Hillsboro 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 Hillsboro, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

336h

PM2.5 Station

336h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	46	24–80	12.1 µg/m³	24h	12
2026-07-20	26	15–45	6.1 µg/m³	24h	16
2026-07-19	29	14–62	7.3 µg/m³	24h	17
2026-07-18	27	12–54	6.5 µg/m³	24h	17
2026-07-17	38	17–65	9.5 µg/m³	24h	18
2026-07-16	31	17–85	7.7 µg/m³	24h	17
2026-07-15	20	12–34	4.9 µg/m³	24h	17
2026-07-14	20	12–41	4.9 µg/m³	24h	18
2026-07-13	16	9–27	3.7 µg/m³	24h	19
2026-07-12	13	8–21	3.1 µg/m³	24h	17
2026-07-11	13	8–22	3.1 µg/m³	24h	18
2026-07-10	14	11–18	3.3 µg/m³	24h	18
2026-07-09	12	9–21	3.0 µg/m³	24h	17
2026-07-08	13	9–20	3.1 µg/m³	24h	17

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