Air quality in Chichibu, Japan today
Mr. Duck’s Air Quality Score
Moderate air today for Chichibu, Japan
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality today in Chichibu is classified as Moderate. The main pollutant identified is PM2.5, fine particulate matter, with a reference concentration of 12.0 µg/m³ based on five valid measurements.
Measurements show that the current PM2.5 level aligns with the referenced value, while no PM10 data are available for this assessment. Data is shown via OpenAQ. 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 data for Chichibu includes measurements of five key air‑quality constituents – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM₂.5) and sulfur dioxide (SO₂). All values come from a single monitoring location at 秩父市日野田町１－１－４４, so the city’s coverage is limited to one station row. Each pollutant was recorded at the same moment, with the most recent timestamp of 2026‑02‑10 22:00 UTC, which falls within the “updated within three days” freshness bucket.
Across the five pollutants the reported numbers are identical for their minimum, median and maximum, indicating no observed variability in this snapshot. NO registers at 0.001 ppm, NO₂ at 0.013 ppm, NOX at 0.014 ppm and SO₂ is recorded as 0.0 ppm, while PM₂.5 measures 12.0 µg/m³. Because the dataset contains only one reading per pollutant, statistical spread such as inter‑percentile ranges cannot be derived; the data simply reflects a single point in time rather than a distribution.
The uniform freshness and singular station mean that the current figures give a precise but very localized picture of air quality in Chichibu on 10 February 2026. Conditions elsewhere in the city or at other times may differ, and the lack of multiple rows limits the ability to assess temporal trends or spatial variation. Nonetheless, the dataset does provide up‑to‑date concentrations for all five monitored pollutants from the one available monitoring 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 reflects five valid measurements and was refreshed recently, with the latest update recorded on 2026‑02‑10 at 22:00 UTC; it is considered “Updated within 3 days.” This snapshot provides a brief view of air quality in Chichibu, but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured fully.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 秩父市日野田町１－１－４４ | no | 0.001 | ppm | 2026-02-10 22:00 UTC |
| 秩父市日野田町１－１－４４ | no2 | 0.013 | ppm | 2026-02-10 22:00 UTC |
| 秩父市日野田町１－１－４４ | nox | 0.014 | ppm | 2026-02-10 22:00 UTC |
| 秩父市日野田町１－１－４４ | pm25 | 12.0 | µg/m³ | 2026-02-10 22:00 UTC |
| 秩父市日野田町１－１－４４ | so2 | 0.0 | ppm | 2026-02-10 22:00 UTC |