Air quality in Minamiuonuma, Japan today
Mr. Duck’s Air Quality Score
Good air today for Minamiuonuma, 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 Minamiuonuma is classified as Good today. The primary pollutant identified is PM2.5, with a measured concentration of 9.0 µg/m³ based on four valid observations reported through OpenAQ.
Overall conditions meet the criteria for the Good category, and no additional pollutants are highlighted in the current 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 Minamiuonuma contains a single monitoring location, identified as 南魚沼市六日町620‑2, and provides measurements for five pollutants: nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). For the four gases measured most recently—NO, NO₂, NOX and PM2.5—the latest reading was recorded on 2026‑02‑10 at 22:00 UTC, which falls within the “updated within three days” freshness category. In contrast, the SO₂ value dates back to 2025‑09‑10 at 05:00 UTC and is flagged as old data, indicating a gap of several months for that pollutant.
All five pollutants show a single reported value because only one row exists for each. The concentration range is essentially flat: NO consistently registers 0.001 ppm, NO₂ 0.013 ppm, NOX 0.014 ppm and SO₂ 0.0 ppm across the dataset, while PM2.5 remains steady at 9.0 µg/m³. Median, minimum and maximum figures are identical for each parameter, reflecting the lack of variability in this limited sample.
Because the coverage consists of just one station, spatial representation of air quality across Minamiuonuma is minimal; conditions elsewhere in the city may differ from those captured at this point. Moreover, the dataset’s freshness is uneven: four pollutants have very recent timestamps, but SO₂ relies on an older measurement, so any current assessment of sulfur dioxide levels would be uncertain. Overall, the data provide a snapshot of low‑level concentrations for the listed gases and particles at one location, with most values updated within days but limited in both geographic scope and temporal depth.
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 four valid measurements and is updated within 3 days, with the latest refresh recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a current view of air quality in Minamiuonuma, but 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 |
|---|---|---|---|---|
| 南魚沼市六日町620-2 | no | 0.001 | ppm | 2026-02-10 22:00 UTC |
| 南魚沼市六日町620-2 | no2 | 0.013 | ppm | 2026-02-10 22:00 UTC |
| 南魚沼市六日町620-2 | nox | 0.014 | ppm | 2026-02-10 22:00 UTC |
| 南魚沼市六日町620-2 | pm25 | 9.0 | µg/m³ | 2026-02-10 22:00 UTC |
| 南魚沼市六日町620-2 | so2 | 0.0 | ppm | 2025-09-10 05:00 UTC |