Air quality in Mashiki, Japan today

Mr. Duck’s Air Quality Score

Good air today for Mashiki, 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 Mashiki is currently classified as Good. The main pollutant identified is PM2.5, with a measured concentration of 8.0 µg/m³ based on five valid observations reported through OpenAQ.

These values indicate that the fine‑particle level is 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

The dataset for Mashiki includes five measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO2), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO2). All observations come from a single monitoring site located at 上益城郡益城町惣領１４７０, so the city’s air‑quality picture is based on one station rather than a network of locations.

Each pollutant has a single recent reading that was last updated on 2026-02-10 22:00 UTC, which falls within the “updated within three days” freshness window. The values are identical across the minimum, median and maximum statistics, indicating no observed variation in the short‑term record for this site. NO registers at 0.001 ppm, NO2 at 0.009 ppm, NOX at 0.010 ppm, PM2.5 at 8.0 µg/m³ and SO2 at 0.002 ppm.

Because the data come from only one location, they capture conditions at that specific point but may not reflect spatial differences across Mashiki. The uniformity of the numbers also means there is no spread to describe short‑term fluctuations; each pollutant shows a single consistent level for the latest reporting period. Users should keep in mind that air quality can change throughout the city and over time, and the current snapshot represents the most recent measurement from this solitary monitoring point.

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 for Mashiki reflects five valid measurements and was refreshed recently, with the latest update recorded on 2026‑02‑10 at 22:00 UTC; it is considered “Updated within 3 days.” While this snapshot provides a current view of citywide air quality, conditions can differ across neighborhoods and change throughout the day, so local variations may exist.

OpenAQ station rows