Air quality in Arrowsmith, Illinois, United States of America today
Mr. Duck’s Air Quality Score
Moderate air today for Arrowsmith, Illinois, 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 Arrowsmith, Illinois is currently classified as Moderate. The primary pollutant identified is PM2.5, with a measured concentration of 17.6 µg/m³ based on five valid observations reported through OpenAQ.
No additional pollutants are listed for today, and the data set consists of five valid measurements. 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 Arrowsmith air‑quality feed includes five measured variables: PM1, PM2.5, relative humidity, temperature and particle count (UM003). All data come from a single monitoring location – the backyard of the John Adams Library – so the dataset consists of one station row for each pollutant. The most recent update for every parameter was recorded on 2026‑02‑11 at 00:00 UTC, meaning the entire set is fresh within the last seven days.
Across the five pollutants the values are identical to their single reported measurement. PM1 registers at 6.631486111217074 µg/m³, while PM2.5 shows a concentration of 17.599999999999998 µg/m³. Relative humidity is measured at 38.91865293714735 %, temperature at 11.499069423145718 °C and the particle counter (UM003) reports 646.0159019470215 particles/cm³. Because each metric has only one observation, the minimum, median, maximum, 10th‑percentile and 90th‑percentile are all the same number.
The data therefore provide a snapshot rather than a range of conditions; there is no spread to describe variability over time or across sites. With just one monitoring point, city‑wide air quality can differ in other neighborhoods or at different times of day, so the figures should be understood as representing conditions at that specific location on 2026‑02‑11. Nonetheless, the dataset is fully up‑to‑date and includes all five standard pollutants typically reported for urban air‑quality monitoring.
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 Arrowsmith, Illinois reflects five valid measurements and was updated today (2026‑02‑11T00:00:00+00:00). These readings represent a snapshot of conditions at the time of collection; air quality can vary by location and time within the city, so values may differ across neighborhoods or later in the day.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| John Adams Library backyard | pm1 | 6.631486111217074 | µg/m³ | 2026-02-11 00:00 UTC |
| John Adams Library backyard | pm25 | 17.599999999999998 | µg/m³ | 2026-02-11 00:00 UTC |
| John Adams Library backyard | relativehumidity | 38.91865293714735 | % | 2026-02-11 00:00 UTC |
| John Adams Library backyard | temperature | 11.499069423145718 | c | 2026-02-11 00:00 UTC |
| John Adams Library backyard | um003 | 646.0159019470215 | particles/cm³ | 2026-02-11 00:00 UTC |