Air quality in Hirosaki, Japan today
Mr. Duck’s Air Quality Score
Good air today for Hirosaki, 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 Hirosaki is classified as Good today. The primary pollutant identified is PM2.5, with a measured concentration of 5.0 µg/m³ based on five valid observations reported through OpenAQ.
Overall conditions meet the Good category criteria, and no additional pollutants are highlighted 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 Hirosaki includes five pollutant measurements taken at a single monitoring site located at 弘前市中野１－１－１. All five rows are recent, with the latest update recorded on 2026-02-10 22:00 UTC, placing every reading within the past three days. The pollutants covered are carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO2), total nitrogen oxides (NOX) and fine particulate matter (PM2.5). Each pollutant is represented by a single value because the minimum, median and maximum for each are identical across the five rows.
Because only one station contributes data, the spatial coverage in Hirosaki is limited to that specific address; there are no additional locations providing complementary readings. The values themselves show no variability: CO is consistently 0.3 ppm, NO stays at 0.007 ppm, NO2 at 0.016 ppm, NOX at 0.023 ppm and PM2.5 remains at 5.0 µg/m³ for every record. This uniformity means the dataset cannot reveal any range or spread of concentrations across the city.
The freshness of the data is strong – all measurements were logged within a few days of the current date, and the “last_updated” timestamp is identical for each pollutant. However, the limited number of stations means that conditions elsewhere in Hirosaki may differ from what these point readings show. Users should keep in mind that the available information reflects only one location at a single moment in time.
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 reflects five valid measurements and is marked as Updated within 3 days, with the latest values recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a recent view of Hirosaki’s air quality but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured in these figures.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 弘前市中野１－１－１ | co | 0.3 | ppm | 2026-02-10 22:00 UTC |
| 弘前市中野１－１－１ | no | 0.007 | ppm | 2026-02-10 22:00 UTC |
| 弘前市中野１－１－１ | no2 | 0.016 | ppm | 2026-02-10 22:00 UTC |
| 弘前市中野１－１－１ | nox | 0.023 | ppm | 2026-02-10 22:00 UTC |
| 弘前市中野１－１－１ | pm25 | 5.0 | µg/m³ | 2026-02-10 22:00 UTC |