Air quality in Hitachi, Japan today
Mr. Duck’s Air Quality Score
Good air today for Hitachi, 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 Hitachi today is classified as Good. The primary pollutant identified is PM2.5, with a measured concentration of 8.0 µg/m³ based on five valid observations reported through OpenAQ.
Overall conditions meet the criteria for a Good rating, and no additional pollutants are highlighted at this time. 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 Hitachi currently draws from a single monitoring site located at 日立市宮田町１－４４－１, giving five rows of observations—one row per measured pollutant. The pollutants available are nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). All values were last refreshed on 2026‑02‑10 22:00 UTC, which falls within the “updated within 3 days” freshness window, so the data represent a very recent snapshot of conditions at that location.
Across the five pollutants the recorded ranges are extremely tight because each metric shows identical minimum, median and maximum values. NO is consistently reported as 0.0 ppm, while both NO₂ and NOX register a steady 0.005 ppm. PM2.5 is measured at 8.0 µg/m³ and SO₂ at 0.001 ppm, with no variation observed in any of the ten‑percentile or ninety‑percentile statistics. This lack of spread indicates that, for the moment, the sensor readings are uniform rather than reflecting a broader distribution of air quality across the city.
Because the coverage relies on just one station, the dataset does not capture spatial differences that may exist elsewhere in Hitachi. The uniform timestamps and single‑site source mean the current picture is limited to conditions at that address on the specified date and time; other neighborhoods could experience different pollutant levels that are not reflected here.
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 was updated within three days, with the latest refresh recorded at 2026‑02‑10 22:00 UTC. This snapshot provides a current view of Hitachi’s air quality but conditions can change across different neighborhoods and times of day, so values may vary locally throughout the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 日立市宮田町１－４４－１ | no | 0.0 | ppm | 2026-02-10 22:00 UTC |
| 日立市宮田町１－４４－１ | no2 | 0.005 | ppm | 2026-02-10 22:00 UTC |
| 日立市宮田町１－４４－１ | nox | 0.005 | ppm | 2026-02-10 22:00 UTC |
| 日立市宮田町１－４４－１ | pm25 | 8.0 | µg/m³ | 2026-02-10 22:00 UTC |
| 日立市宮田町１－４４－１ | so2 | 0.001 | ppm | 2026-02-10 22:00 UTC |