Air quality in Ashikaga, Japan today
Mr. Duck’s Air Quality Score
Good air today for Ashikaga, Japan
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Ashikaga is currently classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 3.0 µg/m³, based on four valid observations recorded by OpenAQ.
Overall conditions meet the Good category criteria with the reported PM2.5 value and no other pollutants noted. 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 dataset for Ashikaga contains measurements for five pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX) and fine particulate matter (PM2.5). These values come from two monitoring locations, giving a total of nine individual rows of data. For NO, NO₂, NOX and PM2.5 the most recent reading was recorded on 2026-02-10 at 22:00 UTC, while the CO measurement is older, last updated on 2024-03-11 at 00:00 UTC.
Across the recent‑data pollutants the observed concentrations are low and tightly clustered. NO ranges from 0.001 to 0.011 ppm with a median of 0.006 ppm; NO₂ spans 0.011 to 0.018 ppm, median 0.0145 ppm; NOX varies between 0.012 and 0.029 ppm, median 0.0205 ppm. PM2.5 values are between 3.0 and 8.0 µg/m³, with a typical (median) level of 5.5 µg/m³. The CO reading is a single value of 0.3 ppm from the older dataset.
The freshness of the data is uneven: four pollutants have updates within the last three days, indicating current conditions are well‑represented for those species, but CO relies on a measurement that is nearly two years old. Because only two stations contribute, spatial coverage is limited; air quality can differ across neighborhoods and times not captured by these points. Users should keep in mind that while recent values give a snapshot of the city’s atmosphere, gaps in station density and older CO data mean the picture is incomplete.
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 Ashikaga is based on four valid measurements and was refreshed within the past three days, with the latest update recorded at 2026‑02‑10 22:00 UTC. While this snapshot reflects current conditions across the monitoring network, air quality can differ by specific location and time of day within the city, so values may vary locally.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 足利市久保田町923 | co | 0.3 | ppm | 2024-03-11 00:00 UTC |
| 足利市久保田町923 | no | 0.011 | ppm | 2024-03-11 00:00 UTC |
| 足利市久保田町923 | no2 | 0.018 | ppm | 2024-03-11 00:00 UTC |
| 足利市久保田町923 | nox | 0.029 | ppm | 2024-03-11 00:00 UTC |
| 足利市久保田町923 | pm25 | 8.0 | µg/m³ | 2024-03-11 00:00 UTC |
| 足利市本城３－２１４５ | no | 0.001 | ppm | 2026-02-10 22:00 UTC |
| 足利市本城３－２１４５ | no2 | 0.011 | ppm | 2026-02-10 22:00 UTC |
| 足利市本城３－２１４５ | nox | 0.012 | ppm | 2026-02-10 22:00 UTC |
| 足利市本城３－２１４５ | pm25 | 3.0 | µg/m³ | 2026-02-10 22:00 UTC |