Air quality in Chikuma, Japan today
Mr. Duck’s Air Quality Score
Moderate air today for Chikuma, 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 Chikuma is currently classified as Moderate. The primary pollutant identified is PM2.5, with a measured concentration of 14.0 µg/m³ based on four valid observations reported through OpenAQ.
These measurements reflect the present conditions without implying any trend or cause. 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 Chikuma contains a single monitoring location that reports four key air‑quality variables: nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX) and fine particulate matter (PM2.5). Each pollutant is recorded in one row, so the station coverage is limited to this lone site at 千曲市粟佐１０６４－４. All four measurements were last updated on 2026‑02‑10 at 22:00 UTC, which falls within the “updated within three days” freshness category, indicating that the most recent data are current but no newer observations are available.
The values are uniform across the record: NO is measured at 0.009 ppm, NO₂ at 0.022 ppm and NOX at 0.031 ppm, each with a minimum, median and maximum of the same figure, showing no observed variation over the reporting period. PM2.5 is reported as 14.0 µg/m³, also without any spread. Because there is only one row per pollutant, statistical summaries such as percentiles or inter‑quartile ranges are not informative; the dataset essentially provides a single snapshot rather than a range of conditions.
Overall, the data set offers complete coverage of the four listed pollutants but from just one location and with no temporal depth beyond the latest timestamp. Consequently, while the figures give an exact point‑in‑time reading for Chikuma, they do not capture spatial or day‑to‑day variability that may exist elsewhere in the city. Users should keep in mind that air quality can differ across neighborhoods and over time, and this single‑site snapshot represents only one moment at one address.
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 Chikuma reflects four valid measurements and was updated within 3 days, with the latest refresh recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a current view of ambient air quality but note that conditions can differ across neighborhoods and change throughout the day, so values may not represent every location or moment within the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 千曲市粟佐１０６４－４ | no | 0.009 | ppm | 2026-02-10 22:00 UTC |
| 千曲市粟佐１０６４－４ | no2 | 0.022 | ppm | 2026-02-10 22:00 UTC |
| 千曲市粟佐１０６４－４ | nox | 0.031 | ppm | 2026-02-10 22:00 UTC |
| 千曲市粟佐１０６４－４ | pm25 | 14.0 | µg/m³ | 2026-02-10 22:00 UTC |