Air quality in Bellingham, Washington, United States of America today

Mr. Duck’s Air Quality Score

Good air today for Bellingham, Washington, United States of America

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Bellingham today is classified as Good. The primary pollutant measured is PM2.5 (fine particles), with a reported concentration of 1.60 µg/m³ based on the latest data set, which includes eleven valid measurements. No PM10 value is available for this assessment.

Data are shown via OpenAQ and reflect the current monitoring results for the city. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The Bellingham air‑quality dataset draws from four monitoring rows that together report six different pollutants: PM2.5, PM1, PM10, relative humidity, temperature and the particle count UM003. The most recent measurements were all taken on 2026‑02‑11 00:00 UTC for five of the parameters, while the PM10 reading is older, recorded on 2025‑01‑13 23:00 UTC. This means that, apart from PM10, the freshest data are less than a day old.

Across the four rows the observed concentrations span modest ranges. PM2.5 values vary from essentially zero up to 7 µg/m³, with a median of about 1.27 µg/m³ and the middle 80 % falling between roughly 0.28 and 5.38 µg/m³. PM1 is tighter, ranging from 0.57 to 1.13 µg/m³, median 0.85 µg/m³, and its central spread (10th‑90th percentiles) runs from 0.63 to 1.07 µg/m³. PM10 shows a higher baseline, between 4.68 and 7.55 µg/m³, median 6.11 µg/m³, with most values clustered between about 5.0 and 7.3 µg/m³.

The ancillary variables also show limited variability. Relative humidity stays within a narrow band of roughly 37 % to 41 %, median just above 39 %. Temperature is consistently around mid‑teens Celsius, ranging from 15.15 °C to 16.65 °C with a median near 15.90 °C. The UM003 particle count ranges from about 285 to 359 particles per cm³, median roughly 322, and most readings lie between 292 and 352.

Overall the dataset provides recent, but limited, coverage: only four rows contribute, and one key pollutant (PM10) is over a year old. Consequently, while the numbers give a snapshot of current conditions in Bellingham, spatial and temporal gaps mean that air quality can still differ across neighborhoods and times not captured here.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The data shown reflects 11 valid measurements and was Updated today (last refreshed on 2026‑02‑11T00:00:00+00:00). These values represent a snapshot of ambient conditions across Bellingham, Washington, but air quality can differ by specific location and time within the city. Use this information as a general guide rather than a precise real‑time reading for any particular spot.

OpenAQ station rows