Air quality in Cornwall, Connecticut, United States of America today
Mr. Duck’s Air Quality Score
Good air today for Cornwall, England, United Kingdom
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Cornwall, Connecticut is rated as Good today. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 6.0 and a PM10 reference value of 15.0 based on 13 valid observations collected via OpenAQ.
Overall conditions meet the criteria for a Good category, reflecting low concentrations of the measured pollutants. 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 Cornwall air‑quality dataset contains six separate measurements, one for each of the listed pollutants – carbon monoxide (CO), nitrogen oxide (NO), ozone (O₃), particulate matter 10 µm or smaller (PM10), particulate matter 2.5 µm or smaller (PM2.5) and sulfur dioxide (SO₂). All six rows are from a single monitoring location in Cornwall, Connecticut, so the station coverage is limited to one site but provides a complete chemical profile for that spot.
Each pollutant record was last updated on 2026‑02‑10 23:00 UTC, which falls within the “updated within 7 days” freshness window. The data therefore represent a very recent snapshot of conditions at the time of collection. For CO the measured value is consistently 0.2 ppm across the dataset; NO registers as 0.0 ppm; O₃ shows a uniform concentration of 0.038 ppm; PM10 is recorded at 15.0 µg/m³; PM2.5 at 6.0 µg/m³; and SO₂ at 0.0006 ppm. Because each pollutant has only one reported value, the minimum, median, maximum, 10th percentile and 90th percentile are all identical, indicating no observed variability within this limited sample.
The dataset’s narrow spatial coverage means it captures conditions at a single point rather than city‑wide variation, and the lack of multiple timestamps or additional stations limits insight into temporal trends. Nonetheless, the presence of all six common air‑quality constituents in a fresh, single‑time snapshot provides a baseline for comparing future measurements as more monitoring locations become available or as data are collected over longer periods.
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 13 valid measurements and is Updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 23:00 UTC. 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 Cornwall, Connecticut.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Cornwall | co | 0.2 | ppm | 2026-02-10 23:00 UTC |
| Cornwall | no | 0.0 | ppm | 2026-02-10 23:00 UTC |
| Cornwall | o3 | 0.038 | ppm | 2026-02-10 23:00 UTC |
| Cornwall | pm10 | 15.0 | µg/m³ | 2026-02-10 23:00 UTC |
| Cornwall | pm25 | 6.0 | µg/m³ | 2026-02-10 23:00 UTC |
| Cornwall | so2 | 0.0006 | ppm | 2026-02-10 23:00 UTC |