Air quality in Hikone, Japan today
Mr. Duck’s Air Quality Score
Moderate air today for Hikone, 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 Hikone is classified as Moderate today. The primary pollutant identified is PM2.5 (fine particles).
Measurements recorded by OpenAQ show a PM2.5 concentration of 20.0 µg/m³, based on four valid observations. No PM10 value is available for this assessment. 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 Hikone includes four measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX) and fine particulate matter (PM2.5). All of these values come from a single monitoring location at 西今町800, so the city’s coverage is limited to one site rather than a network of stations.
The most recent readings were recorded on 2026-02-10 at 22:00 UTC, which falls within the “updated within three days” freshness window for every pollutant. NO shows a uniform value of 0.0 ppm across its minimum, median and maximum, indicating no detectable concentration at the time of measurement. Both NO₂ and NOX are reported at exactly 0.014 ppm, with identical low‑10th and high‑90th percentiles, suggesting very little variation in these gases during the sampling period. PM2.5 is recorded at a single value of 20.0 µg/m³, again with no spread between its minimum, median and maximum.
Because the data set consists of only four rows from one sensor, it provides a snapshot rather than a comprehensive picture of air quality across Hikone. The lack of multiple stations means spatial differences in pollutant levels cannot be assessed, and any changes that occur outside the narrow time window of the last update are not captured here. Users should keep in mind that conditions may differ elsewhere in the city or at other times.
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 Hikone is based on four valid measurements and was refreshed recently, having been updated within three days (last update: 2026‑02‑10 22:00 UTC). This snapshot reflects conditions at the time of collection; air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 彦根市西今町800 | no | 0.0 | ppm | 2026-02-10 22:00 UTC |
| 彦根市西今町800 | no2 | 0.014 | ppm | 2026-02-10 22:00 UTC |
| 彦根市西今町800 | nox | 0.014 | ppm | 2026-02-10 22:00 UTC |
| 彦根市西今町800 | pm25 | 20.0 | µg/m³ | 2026-02-10 22:00 UTC |