Air quality in Kawaguchi, Japan today

Mr. Duck’s Air Quality Score

Good air today for Kawaguchi, Japan

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Kawaguchi is classified as Good today. The primary pollutant identified is PM2.5, with a measured concentration of 8.0 µg/m³ based on fourteen valid observations reported through OpenAQ.

No other pollutants reached the reporting threshold, and the data reflect the current assessment for this location. 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 Kawaguchi dataset currently includes six measured pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). Data come from three monitoring stations that together provide 14 individual rows of observations, each representing a recent reading taken at the same moment: 2026‑02‑09 02:00 UTC. Because every pollutant’s most recent timestamp falls within the last seven days, the information reflects the city’s air quality as it stood on that date rather than historical or delayed values.

Across the three sites the recorded concentrations show a modest spread. For gases measured at the East Ryōka‑1‑27‑1 location, NO ranges from 0.004 ppm to 0.019 ppm with a median of 0.005 ppm; NO₂ varies between 0.010 ppm and 0.027 ppm (median 0.011 ppm); and NOX spans 0.014 ppm to 0.046 ppm (median 0.016 ppm). The same station reports PM2.5 values from 4 µg/m³ up to 8 µg/m³, centered around a median of 7 µg/m³. SO₂ is observed at a single constant level of 0.001 ppm, while CO is measured only at the Kobe‑461 site at 0.4 ppm. The data therefore provide full coverage for NO, NO₂, NOX and PM2.5, but only one reading each for SO₂ and CO, indicating uneven spatial representation among pollutants.

Overall, the dataset offers a fresh snapshot from three locations with consistent timing, yet the limited number of stations means that conditions can differ across other parts of Kawaguchi. Users should keep in mind that while the reported ranges capture current variability at these sites, they do not encompass the entire city’s micro‑scale fluctuations.

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 14 valid measurements and was Updated within 3 days, with the latest reading recorded at 2026‑02‑09T02:00:00+00:00. This snapshot provides a current view of Kawaguchi’s air quality, 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