Air quality in Hamamatsu, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Hamamatsu, 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 Hamamatsu is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).

Measurements show a PM2.5 concentration of 10.0 µg/m³, based on 43 valid observations reported through OpenAQ. No PM10 reference value is available for this 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 Hamamatsu dataset contains recent measurements for six key air‑quality gases and particles: carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). In total the feed includes nine sensor rows, but coverage is uneven across pollutants – CO, NO, NO₂ and NOX each have data from nine stations, PM2.5 also comes from nine locations, while SO₂ is reported by only four stations.

All of the latest readings were recorded on 2026‑02‑10 at 22:00 UTC, so the dataset reflects conditions that are less than three days old for every pollutant. The typical values differ noticeably among the substances. For CO the median concentration is 0.3 ppm with a range from 0.3 to 0.4 ppm; NO shows a much lower spread, ranging from virtually zero up to 0.016 ppm and a median of 0.001 ppm. NO₂ values sit between 0.005 and 0.016 ppm (median 0.010 ppm), while the broader NOX metric varies from 0.005 to 0.031 ppm with a median near 0.011 ppm. PM2.5 concentrations are measured in micrograms per cubic metre, ranging from 4.0 to 10.0 µg/m³ and centering around a median of 7.0 µg/m³. SO₂ is the least represented pollutant, with only four stations reporting values that stay at or below 0.001 ppm; the median is effectively zero.

Because the number of stations differs, some parts of the city are monitored more densely for gases like CO and NOX than for sulfur dioxide. The data’s freshness is good overall—every pollutant has a timestamp within the last three days—but the limited SO₂ station count means that city‑wide conclusions for that gas should be drawn cautiously. Likewise, while most pollutants show tight median values, the broader range of NOX suggests more variability in nitrogen oxide emissions across the monitored sites.

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 dataset for Hamamatsu includes 43 valid measurements and is Updated within 3 days, with the most recent values recorded at 2026‑02‑10T22:00:00+00:00. These figures represent a single snapshot of conditions across the city; air quality can differ by specific location and time of day, so individual experiences may vary from the reported averages.

OpenAQ station rows