Air quality in Itoigawa, Japan today
Mr. Duck’s Air Quality Score
Good air today for Itoigawa, 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 Itoigawa today is classified as Good. The primary pollutant measured is PM2.5, with a reference concentration of 5.0 µg/m³ based on five valid observations reported through OpenAQ.
Overall conditions meet the Good category criteria, and the available data indicate that fine particulate levels are at or below the referenced value. 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 Itoigawa contains measurements for five pollutants – 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 糸魚川市横町３丁目２５７－７, so the city’s air‑quality picture is based on one station row.
Each pollutant shows a single recorded value that also serves as its minimum, median and maximum for the period covered. NO registers 0.0 ppm, while both NO₂ and NOX are reported at 0.002 ppm. PM2.5 measures 5.0 µg/m³ and SO₂ is 0.001 ppm. Because the range collapses to a single point for every pollutant, there is no observed spread in the data – the typical (median) reading equals both the lowest and highest reported figure.
The most recent update for all five parameters was logged on 2026‑02‑10 at 22:00 UTC, which falls within the “updated within three days” freshness bucket. This means the information is current as of early February 2026, but because only one sensor contributes data, temporal and spatial variability across Itoigawa cannot be captured. Consequently, while the available numbers are recent, they represent a very limited snapshot and may not reflect conditions at other neighborhoods or times of day.
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 are based on five valid measurements and have been updated within 3 days, with the most recent reading recorded at 2026‑02‑10T22:00:00+00:00. While these values reflect current conditions across Itoigawa, air quality can differ by specific location and time of day within the city, so individual experiences may vary from the snapshot presented here.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 糸魚川市横町３丁目２５７－７ | no | 0.0 | ppm | 2026-02-10 22:00 UTC |
| 糸魚川市横町３丁目２５７－７ | no2 | 0.002 | ppm | 2026-02-10 22:00 UTC |
| 糸魚川市横町３丁目２５７－７ | nox | 0.002 | ppm | 2026-02-10 22:00 UTC |
| 糸魚川市横町３丁目２５７－７ | pm25 | 5.0 | µg/m³ | 2026-02-10 22:00 UTC |
| 糸魚川市横町３丁目２５７－７ | so2 | 0.001 | ppm | 2026-02-10 22:00 UTC |