Air quality in Matsumoto, Japan today

Mr. Duck’s Air Quality Score

Good air today for Matsumoto, 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 Matsumoto is currently classified as Good. The main pollutant identified is PM2.5, with a measured concentration of 7.0 µg/m³ based on ten valid observations reported through OpenAQ.

These values indicate that the fine‑particle level remains within the reference range for this category. 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

Matsumoto’s OpenAQ feed 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). The data come from ten individual rows representing two monitoring stations, so each pollutant is not necessarily captured at every location. For CO the single row originates from a sensor on 松本市渚３丁目４５－４, while all other pollutants are reported by a station at 松本市島立１０２０. The most recent timestamp across the dataset is 2026‑02‑10 22:00 UTC, and every entry carries a “Updated within 3 days” note, indicating that the information is fresh as of early February.

The recorded values show very narrow spreads. CO is consistently measured at 0.2 ppm, with no variation across its single observation. NO ranges from 0.0 to 0.006 ppm (median 0.003 ppm), while NO₂ sits between 0.004 and 0.007 ppm (median 0.0055 ppm). NOX values are slightly higher, ranging from 0.004 to 0.013 ppm (median 0.0085 ppm). PM2.5 concentrations are clustered tightly around 6–7 µg/m³ (median 6.5 µg/m³), and SO₂ registers as 0.0 ppm in all reported rows. Because the dataset contains only two stations, spatial coverage is limited; conditions measured at 松本市島立１０２０ may not reflect other neighborhoods, especially where local sources differ.

Overall, the data set provides a recent snapshot of six key pollutants but with modest station density and very little variability in the recorded values. Users should keep in mind that air quality can change across different parts of Matsumoto and over time, so this snapshot represents conditions at the specific monitoring points on 10 February rather than city‑wide averages.

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 ten valid measurements and is updated within 3 days, with the most recent reading recorded at 2026‑02‑10T22:00:00+00:00. These values provide a current snapshot of air quality in Matsumoto, but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured by this summary.

OpenAQ station rows