Air quality in Denver, Colorado, United States of America today

Mr. Duck’s Air Quality Score

Good air today for Denver, Colorado, 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 today in Denver is classified as Good. The main pollutant is PM2.5 (fine particles). The reported PM2.5 concentration is 0.0 µg/m³ and the PM10 concentration is 16.0 µg/m³. These concentrations correspond to the reference values used for the assessment. Data is shown via OpenAQ. No exceedances were recorded for the pollutants monitored.

A total of 77 valid measurements were incorporated into the analysis, representing observations from across the city. The dataset reflects the current conditions captured by the monitoring network. All reported values are consistent with the Good category criteria. The measurement count ensures a robust representation of the city's air quality for this period. 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 Denver air‑quality feed pulls data from 64 monitoring stations and contains 168 individual measurement rows. Of those rows, 77 have been recorded within the past 30 days, while 68 are older and 23 lack a clear timestamp, so the overall picture includes both recent and historic observations. The dataset currently provides values for carbon monoxide (CO), nitrogen dioxide (NO₂), particulate matter of three size fractions (PM₁, PM₂.₅, PM₁₀), relative humidity, temperature, and particle count (UM003). Measurements for ozone (O₃) and sulfur dioxide (SO₂) are not present in the latest export. Each pollutant’s most recent reading is from either 2026‑02‑10 23:00 UTC or 2026‑02‑11 01:00 UTC, indicating that the newest data points are only a couple of days old.

Across the available pollutants the observed ranges are broad. PM₂.₅ values span from 0.0 µg/m³ up to 37.2 µg/m³ with a median of 2.4 µg/m³, while PM₁₀ ranges from 0.44 µg/m³ to 47.8 µg/m³ and median sits at 4.08 µg/m³; PM₁ shows a minimum of 0.0 µg/m³, a maximum of 22.1 µg/m³ and a median of 1.24 µg/m³. NO₂ measurements are low, ranging from –0.034 ppm to 0.0159 ppm with a median of 0.0046 ppm, and CO varies between 0.2 ppm and 0.4 ppm, median 0.2 ppm. Relative humidity in the city’s sensors runs from about 19.7 % to 50.6 % with a typical value near 27.6 %, while temperature covers 4.48 °C to 28.72 °C, median roughly 12.8 °C. The particle‑count metric (UM003) records from 0 to 1 234 particles/cm³, median 176 particles/cm³.

Coverage differs markedly among pollutants: PM₂.₅ benefits from 64 rows, whereas NO₂, humidity, temperature, and UM003 each rely on only 13 rows, and CO on three rows. This uneven sampling means that some aspects of Denver’s air quality are captured more comprehensively than others, and because a portion of the data is older or timestamp‑unknown, conditions can vary across neighborhoods and times beyond what the most recent snapshots show.

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 77 valid measurements and is updated within 30 days. The most recent update was on 2026-02-11T01:00:00+00:00. Air quality can vary by location and time within Denver, so this snapshot may not reflect conditions at all sites or moments.

OpenAQ station rows