Air quality in Aso, Japan today
Mr. Duck’s Air Quality Score
Good air today for Aso, 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 Aso is currently classified as Good. The main pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 1.0 µg/m³, based on one valid observation.
Data are shown via 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 current station data listed for this city is focused on particulate matter (PM). Only one monitoring point contributes to the dataset, reporting a PM2.5 concentration of 1.0 µg/m³ measured at 阿蘇市一の宮町宮地２４０２, with the most recent timestamp recorded on 2026-02-10 22:00 UTC. Because there is just a single row, the dataset contains no variation in values—the minimum, median, and maximum are all identical at 1.0 µg/m³, and the 10th and 90th percentiles match this figure as well.
With only one station, coverage across Aso is extremely limited, meaning the reported number reflects conditions at a specific location rather than the broader city environment. The data freshness is relatively good; the last update falls within three days of the current date, satisfying the “updated within 3 days” flag. However, the absence of additional rows or other pollutants leaves the overall picture sparse, so temporal and spatial changes in air quality cannot be assessed from this source alone.
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 current reading for Aso is based on a single valid measurement and was refreshed recently, Updated within 3 days (last update: 2026‑02‑10T22:00:00+00:00). This snapshot reflects conditions at the time of sampling; air quality can differ across neighborhoods and change throughout the day, so values may vary from one location to another within the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 阿蘇市一の宮町宮地２４０２ | pm25 | 1.0 | µg/m³ | 2026-02-10 22:00 UTC |