Air quality in Kōfu, Japan today

Mr. Duck’s Air Quality Score

Good air today for Kōfu, 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 Kōfu is rated as Good today. The primary pollutant identified is PM2.5, with a measured concentration of 9.0 µg/m³. Data are based on twelve valid measurements collected through OpenAQ.

Overall conditions meet the criteria for a Good category according to the provided 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 Kōfu contains measurements of six pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). These values come from a total of twelve individual rows, representing three monitoring stations that have reported within the last few days. All pollutants show a most‑recent timestamp of 2026-02-10 22:00 UTC, indicating that the newest data are no older than three days.

PM2.5 readings range from a low of 6.0 µg/m³ to a high of 9.0 µg/m³, with a median value of 7.0 µg/m³ and the 10th‑percentile at about 6.2 µg/m³ and the 90th‑percentile near 8.6 µg/m³. Carbon monoxide varies between 0.3 ppm and 0.4 ppm, centering on a median of 0.35 ppm; the spread is narrow, with the 10th‑percentile at roughly 0.31 ppm and the 90th‑percentile at 0.39 ppm. Nitrogen oxide values are very low, from 0.001 ppm up to 0.002 ppm, median 0.0015 ppm; NO₂ is reported as a single value of 0.015 ppm across all rows, while NOX spans 0.016 ppm to 0.017 ppm with a median of 0.0165 ppm. Sulfur dioxide was recorded at 0.0 ppm at the one station that measures it.

The coverage is uneven: three stations provide data for most gases, but only one reports SO₂, and the number of rows per pollutant differs (e.g., three rows for PM2.5 versus a single row for SO₂). Because the dataset reflects recent snapshots rather than continuous streams, conditions can still differ across neighborhoods or times of day that are not captured here.

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 reflect twelve valid measurements and were updated within three days, with the most recent reading recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a current view of air quality across Kōfu, but conditions can differ by neighbourhood and change throughout the day, so values may vary locally and over short time periods.

OpenAQ station rows