What is the air quality trend in Bellingham?

Over the past 14 days, Bellingham had an average AQI of 22 based on station measurements. The worst day was 2026-07-21 with AQI 50.

How is Bellingham air quality measured?

Air quality in Bellingham 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 Bellingham, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

301h

PM2.5 Station

301h · 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	50	26–61	12.5 µg/m³	21h	1
2026-07-20	21	13–38	4.9 µg/m³	23h	1
2026-07-19	22	5–34	5.2 µg/m³	23h	2
2026-07-18	21	9–34	4.9 µg/m³	24h	1
2026-07-17	29	16–53	7.0 µg/m³	24h	1
2026-07-16	29	13–42	7.1 µg/m³	19h	1
2026-07-15	30	9–53	7.3 µg/m³	24h	1
2026-07-14	23	9–42	5.6 µg/m³	24h	1
2026-07-13	18	5–34	4.4 µg/m³	24h	2
2026-07-12	14	5–34	3.4 µg/m³	24h	2
2026-07-11	16	5–30	3.8 µg/m³	24h	2
2026-07-10	16	5–34	3.8 µg/m³	23h	2
2026-07-09	16	5–25	3.7 µg/m³	14h	2
2026-07-08	15	5–21	3.5 µg/m³	10h	2

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