Air quality in Hanyu, Japan today
Mr. Duck’s Air Quality Score
Moderate air today for Hanyu, 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 Hanyu today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 15.0 µg/m³ based on five valid observations.
Data are shown via OpenAQ and reflect the current monitoring results for the city. 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 Hanyu includes measurements of five key pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). All observations come from a single monitoring location at 羽生市東9-1-1, so the station count is one, but each pollutant is represented by its own row, giving five recent entries in total. The most recent timestamp across the whole set is 2026‑02‑10 22:00 UTC, and every pollutant shares this same update time, indicating that the data are uniformly fresh within the last three days.
The recorded values show a very narrow spread for each gas. NO, SO₂ and the combined NOX metric all read exactly 0.0 ppm, while both NO₂ and NOX register a consistent 0.019 ppm. Because the minimum, median, maximum, 10th percentile and 90th percentile are identical for each pollutant, there is no observed variability in the recent measurements at this site. PM2.5 stands out as the only particulate measurement, with a single value of 15.0 µg/m³ that likewise appears across all statistical markers, indicating no fluctuation during the reporting period.
Overall, the data provide complete coverage of the listed pollutants but are limited to one location and a single snapshot in time. While the freshness of the timestamps is good – all entries were updated on the same day – the lack of multiple stations or repeated measurements means that temporal trends and spatial differences within Hanyu cannot be captured from this dataset alone. Users should keep in mind that air quality can differ across neighborhoods and over longer periods, even though the current snapshot shows uniform values for each pollutant at the monitored site.
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 Hanyu reflects five valid measurements and was updated within 3 days, with the latest reading recorded at 2026‑02‑10T22:00:00+00:00. These values represent a snapshot of current conditions; air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in this summary.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 羽生市東9-1-1 | no | 0.0 | ppm | 2026-02-10 22:00 UTC |
| 羽生市東9-1-1 | no2 | 0.019 | ppm | 2026-02-10 22:00 UTC |
| 羽生市東9-1-1 | nox | 0.019 | ppm | 2026-02-10 22:00 UTC |
| 羽生市東9-1-1 | pm25 | 15.0 | µg/m³ | 2026-02-10 22:00 UTC |
| 羽生市東9-1-1 | so2 | 0.0 | ppm | 2026-02-10 22:00 UTC |