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

Mr. Duck’s Air Quality Score

Good air today for Bellevue, Nebraska, 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 Bellevue, Washington is classified as Good today. The primary pollutant measured is PM2.5, with a reported concentration of 0.6 µg/m³. A total of 12 valid measurements contributed to this assessment. The assessment reflects the most recent set of observations collected throughout the day. PM10 data were not available, so the PM10 reference value is not applicable.

These values are derived from data shown via OpenAQ. The 12 valid measurements represent the sampling points used to calculate the overall rating. Data are aggregated from multiple monitoring stations across the city. The latest measurement timestamp is 2026-02-23 12:00 UTC. 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 Bellevue air‑quality feed draws from five monitoring stations that together contribute eighteen recent rows of data. Six pollutants are represented: fine particles (PM2.5), coarse particles (PM10), ultrafine particles (PM1), relative humidity, temperature, and particle count (UM003). For PM2.5, PM1, relative humidity, temperature and UM003 the most recent measurement was recorded on 2026‑02‑11 00:00 UTC, while the lone PM10 observation dates back to 2025‑01‑13 23:00 UTC. Across the dataset, eleven rows were updated within the past thirty days, two are classified as older, and five have an unknown freshness status.

PM2.5 values range from a low of 0.19 µg/m³ to a high of 2.58 µg/m³, with a median of about 0.52 µg/m³; the tenth percentile sits near 0.19 µg/m³ and the ninetieth percentile at 1.79 µg/m³, indicating most recent readings cluster in the lower part of the scale. PM1 shows a broader spread, from 0 µg/m³ up to 1.73 µg/m³, median 0.028 µg/m³, with the central ninety percent of observations between roughly 0.006 µg/m³ and 1.39 µg/m³. Relative humidity in the city varies between 34.6 % and 66.1 %, median 47.1 %, while temperature sits between 13.1 °C and 19.5 °C, median 17.5 °C. Particle concentration (UM003) is recorded between 136 particles/cm³ and 446 particles/cm³, median 140 particles/cm³.

The dataset is unevenly balanced: PM10 is represented by a single, older record, whereas the other five pollutants benefit from multiple recent entries across several stations. Consequently, while the most current data for most pollutants reflect conditions as of early February 2026, the limited and dated PM10 measurement means city‑wide particulate trends for that metric are less certain. Users should keep in mind that conditions can differ by neighborhood and time, especially for pollutants with sparse coverage.

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

This dataset includes 12 valid measurements and is updated within 30 days. The most recent data were recorded on 2026-02-11T00:00:00+00:00. Air quality can vary by location and time within Bellevue, so this snapshot may not reflect conditions everywhere in the city.

OpenAQ station rows