Air quality in Danbury, Connecticut, United States of America today
Mr. Duck’s Air Quality Score
Moderate air today for Danbury, Connecticut, 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 Danbury, Connecticut is currently classified as Moderate. The primary pollutant identified for today is PM2.5 (fine particles).
Measurements show a PM2.5 concentration of 16.4 µg/m³ and a PM10 level of 46.0 µg/m³ based on two valid observations reported through OpenAQ. 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 Danbury air‑quality dataset contains three pollutant measurements collected from a single monitoring station. All three key pollutants—ozone (O3), particulate matter up to 10 µm (PM10) and fine particulate matter up to 2.5 µm (PM2.5)—are represented, but the timing of their most recent updates differs. The ozone reading is from 2025‑10‑02 11:00 UTC, which makes it considerably older than the other two values that were last refreshed on 2026‑02‑10 23:00 UTC. Because only one station contributes data, the spatial coverage across Danbury is limited to a single point rather than a citywide network.
The numeric values are uniform within each pollutant’s record. Ozone registers at 0.0 ppm, indicating no variation in the reported range (minimum, median and maximum all equal zero). PM10 shows a consistent concentration of 46.0 µg/m³ across its minimum, median, 10th percentile and 90th percentile, suggesting that only one measurement is available rather than a distribution of observations. Likewise, PM2.5 is recorded at a steady 16.4 µg/m³ for all statistical points. This lack of spread reflects the single‑row nature of the dataset rather than natural variability in air quality.
Overall, the data set offers recent information for particulate matter but an older snapshot for ozone. With only one monitoring location and no multiple readings over time, the figures provide a limited picture of Danbury’s air conditions; actual concentrations can differ across neighborhoods and change throughout the day.
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 for Danbury reflects two valid measurements and was updated within 3 days, with the most recent reading recorded at 2026‑02‑10T23:00:00+00:00. This snapshot provides a brief view of current conditions; however, air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Danbury | o3 | 0.0 | ppm | 2025-10-02 11:00 UTC |
| Danbury | pm10 | 46.0 | µg/m³ | 2026-02-10 23:00 UTC |
| Danbury | pm25 | 16.4 | µg/m³ | 2026-02-10 23:00 UTC |