Air quality in Boulder County, Colorado, United States of America today
Mr. Duck’s Air Quality Score
Good air today for Boulder County, Colorado, United States of America
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Boulder County, Colorado is rated as Good today. The primary pollutant identified is PM2.5 (fine particles). Measurements from five valid monitoring sites show a PM2.5 reference value of 0.0 µg/m³. No PM10 reference value is available for this assessment.
Data are shown via OpenAQ and reflect the current conditions based on the latest observations. 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 Boulder County air‑quality feed draws from five recent data rows collected at a single monitoring site, and each row was last updated on 2026‑02‑11 01:00 UTC, well within the seven‑day freshness window used by OpenAQ. The dataset includes measurements for five pollutants: PM1, PM2.5, relative humidity, temperature and UM003 (particle count).
Both particulate matter metrics, PM1 and PM2.5, report a uniform value of 0.0 µg/m³ across the entire set, with no observed variation (minimum, median and maximum are all zero). In contrast, the meteorological variables show a single recorded point: relative humidity is consistently 31.1031665802002 % and temperature remains steady at 9.887500031789143 °C. The UM003 sensor records 34.480833339691166 particles per cubic centimetre, again with no spread in the data. Because each pollutant has only one recorded value, there is no statistical range or percentile distribution to describe beyond these exact figures.
The coverage across pollutants is uneven: while all five variables are present, the particulate matter fields contain only zero readings, offering little insight into actual particle concentrations. The humidity, temperature and UM003 measurements provide a snapshot rather than a trend, and because they come from just one station, spatial variation within Boulder County cannot be captured. Users should keep in mind that conditions can differ across neighborhoods and times of day, and the current dataset reflects only this single moment in early February 2026.
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 five valid measurements and was updated today (2026‑02‑11T01:00:00+00:00). These values provide a snapshot of current conditions, but air quality can vary across different neighborhoods and times of day within Boulder County, Colorado. Consequently, the figures represent an approximate view rather than a precise reading for every location at any given moment.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| TBS | pm1 | 0.0 | µg/m³ | 2026-02-11 01:00 UTC |
| TBS | pm25 | 0.0 | µg/m³ | 2026-02-11 01:00 UTC |
| TBS | relativehumidity | 31.1031665802002 | % | 2026-02-11 01:00 UTC |
| TBS | temperature | 9.887500031789143 | c | 2026-02-11 01:00 UTC |
| TBS | um003 | 34.480833339691166 | particles/cm³ | 2026-02-11 01:00 UTC |